Water, water everywhere, but not a drop to drink. The Ark is in the middle of an enormous ocean. You can't drink salt water. That means that you have to have water filtration plants to make the water fit for human consumption. With ten times more people than the Ark can normally provide for, the filters probably can't keep up with demand, hence the rationing. Not sure what they eat on the Ark though. Algae? I've heard algae is the food of the future.
Anyway, conditions will get much better for everyone once a significant portion of the population dies in this war. The survivors can hold a big party and build swimming pools and other nice things. :foodndrink: