I actually only serve water, all day! I started out serving juice @ snack and milk at lunches...then cut out the juice (they were filling up in it)...then just milk@ lunch. I was throwing so much milk out at lunch I decided to just go with water; they get a very well rounded, healthy variety of foods in their day that more than make up for it. I am very up front in interview about this as well. Lots less dishes to wash as well! Keep in mind that they are getting liquids from their food as well. I would not let it bother you too much if they don't drink tons of water. IMO if you are getting at least 4 wet diapers in a day, they are hydrated.