I have to disagree with all the sugary soda alternatives advice given here. None of these is a good dieting replacement to water in the quantities water should be consumed. Still sugar (insulin response) and high calorie (ie; juices, "milks", "creams").
Miscommunication... I wasn't very clear. Yes, staple drinks should be water, especially when you're on restricted calorie intake.
Milk and cream alternative are just that: a replacement for dairy. Not to replace all your water intake... I got carried away with the brainstorm, since I love to cook and experiment with food.

Still, if your diet allows it, pancakes made with rice flour and rice milk, or oats and oat milk are a lovely (dairy free) alternative.
And if you allow yourself one drink different from water, like a chai, then a dash of coconut cream is a nice addition.