Potions of water breathing

Realistic mode is an upcoming game difficulty for Survival in Beta, with several suggestions by Notch. http://twitter.com/notch/status/28830498629

It will be the hardest difficulty level, requiring you to eat every minecraft week (140 minutes) and drink every 3 minecraft days (1 hour).

It may also include weight, with a maximum of 10,000kg.

Possible object weights in kg:

These statistics imply the game will be much more difficult in this mode.

(Note that the weights above are merely suggested and may not be implemented into the game.)