Diet drinks like Diet Coke for example may have zero sugar but like most ‘diet’ drinks they still have artificial flavours in them and can actually be more dangerous for your health. Water is the best thing if you want to treat yourself to a sugary drink do it say once a week. I crave Pepsi all the time but I have one glass of it once a week I find now if I drink to much of it it makes me feel bloated x
Ditch all the artificial sweeteners and drink water. If you need flavour use fruit combinations in your water. You can even get drink bottler with an internal chamber to hold the fruit.
Also green tea is really good for you.
I’ll have an occasional coffee as a treat, but water and green tea are my daily drinks