Tutorials/Survival with no enabled data packs

Introduction
With the advent of 1.13, datapacks have been added to the game and can be enabled and disabled, and many of the vanilla game mechanics, such as advancements, mob drops, chest loot, the vanilla crafting system, and more are now stored in a default datapack called vanilla. Disabling the vanilla datapack, without adding any custom datapacks, will cause all that to disappear, which considerably adds to the difficulty of the game. The conventional tech tree of wood to stone to more advanced technology is no longer operant, searching through chests is of no use as the chests will have nothing in them, and killing mobs are useless as well as they no longer drop anything. As a result, even basic survival becomes a challenge in such a world, and very different approaches are required in order to make actual progress.

To disable the vanilla datapack, you need to have access to commands. Upon initial entry into the world, type in.

Finding a Farmer Villager


The first thing you need to do is to find a farmer villager. This is important, because although one may survive on only apples from chopping down oak and dark oak trees, the only way to make progress up the tech tree is through trading with villagers - this is because there is absolutely no crafting whatsoever in this world. The farmer villager is necessary, because it is the only way to gain emeralds from this world at start, as its initial trades include a trade of wheat, potatoes, or carrots for emeralds. All other trades are either trades that require you to trade in emeralds, which you do not have initially, or it requires you to trade in an item you cannot get as crafting and mob drops are unavailable, or for the cleric villager and shepherd villager, you simply do not have the tools yet to get the item. This is a hard task to do, as villages within a typical world are usually hundreds of blocks apart from each other, and many villages will have not even a single farmer villager. When you come upon a village, if the village has a farm or multiple, harvest all the crops in the farm of the village, as even though there may not be a farmer villager in the village, it is important to gather as much crops such that when you do finally encounter said farmer villager you can finally trade your crops for emeralds. The crops also provide an alternative source of food for you instead of the apples derived from cutting down trees. However, do not destroy the farmland, as you would have no way of restoring the farmland once destroyed, as it is impossible to acquire a hoe.

Trading with Villagers
Once you have found a farmer villager, hooray! You now have the ability to get emeralds. However, you may need to farm some more, as you will need a lot of emeralds for the various trades you need to make. Once you think you have enough emeralds, it is now time to find other villagers, most importantly the armourer, the toolsmith, the weaponsmith, and the fletcher. The world outside of villages and your temporary houses on your search for villages is still a very dangerous place, and it may be wise to get some protection and means of defence against mobs such as creepers and skeletons. The armourer will provide the necessary armour for protection, with various enchantments as well, the weaponsmith will provide handheld close-range weapons such as the sword and the axe, and the fletcher will provide the ranged weapon of the bow and arrow. Meanwhile, the toolsmith will provide you with a pickaxe and shovel, useful for breaking and gathering more blocks. You can also get items from the shepherd, the librarian, and the leatherworker villagers if you wish to. If you find that a particular type of villager is not available at the village where you found your farmer villager, you will need to go to other villages that you have either visited previously or new villages in order to find the villager you wish to trade with.

If you wish to trade with a cleric villager, you would need to find gold ore and mine it up, which would require you to first get the pickaxe from the toolsmith. Unless you choose to operate an open-pit mine in your world, mining in the world is dark and dangerous, because there are very few sources of light available for you to use at this point in time - lava that you could attempt to use by controlling its flow underground, and the four torches around a coal block stick scattered around the villages, though those may need to be used to light up the village at night. Without light sources, it may be very hard to tell where potential hostile mobs are underground, and when you are made aware of them by noise or by damage, it may already be too late. For gold, it may be better to mine in a mesa, as there is more of an abundance of gold closer to the surface, so you do not have to dig as deep or explore as far down a cave to get the gold ore you need. Once you get enough gold ore, cook it up in a furnace for your gold, as the furnace recipes still are functional, until you have enough to unlock the second and third tiers of the cleric villager trades.

Entering the Nether
In order to enter the nether, you will need to find or create at least ten obsidian blocks. Obsidian blocks are usually found in the overworld when water flows above a still block of lava, usually falling from a source block down to either an underground pool of lava or the natural layer of lava on the y-coordinate 11 and below in caves and ravines. If you find none, you may attempt to lead water to the lava by digging a tunnel from a lake, a river, the ocean, or a single water source block to a lava pool or the natural layer of lava, as you have no method of directly transporting source blocks for buckets are unobtainable. Once you have created and mined the necessary obsidian for the nether portal, it is now time to open the portal. Although it is impossible to acquire a flint and steel in this world, a nether portal can be activated by any flame, including one spread from neighbouring lit blocks and lava. Thus, build your portal by a lava source block, and wait until the random ticks allow the lava fire to spread to the portal and light it. Now you can enter the nether.