Wow !! I offer milk at breakfast and lunch, 100% juice at snacks and water during the day (mostly in summer) as much as they would want but they dont drink much of it. I only give a little bit of juice and milk and ONLY after they eat their meals or else, they will drink, fill up, and wont eat.

I see no harm in juice and especially milk !!! Milk does your body good and its important. I dont like throwing it out as well (or food in that matter) because its a waste, but that is why I give only a little bit at first and at lunch they get their desert after they drink at least 3/4 of the milk (used to be desert before but then wouldnt drink milk). If in the end there is a waste, I was reminded once that its the parents that technically pay for it :\

Kids mostly drink when I give them a straw, they looovveee it