My dr had me add powdered milk to everything when I got to the full liquid stage to bump up the protein. 1 scoop in yogurt, pudding, soup, shakes too! As for water try room temp. But if your having discomfort it might be gas… so try walking more (down the hall 2-3x) before and after sipping. I didn't get all 64oz in for a couple of weeks. Way to go, your doing great!