How do you get your kids to drink more water? They cant stand drinking it plain…
I make them drink more… they can only have what you offer 
Electric lights single powder mix
Make infusions. Put fruit or cucumbers or fresh herbs like mint or rosemary in a pitcher of water to flavor it. Make herbal and fruit teas, or just use decaffeinated tea bags to make unsweetened iced tea. Get seltzer water. Keep a pitcher of filtered water in the fridge. Vitamin Water and Hint bottled water could be worse, and check out Liquid Death. Let them pick out reusable water bottles (preferably stainless steel and not plastic) and find ways they can carry it with them everywhere.
Add flavoring. I myself don’t like plain water either