Alternatives to Water?

I will be starting Chemo on 4/9/26. I am terrible at drinking enough water. I know that I need to stay hydrated but will things like Chocolate milk, Sunn D and tea count as my water intake? Which juice might be best? I was drinking orange juice after my mastectomy which I don't drink a lot of because of heartburn. It gave me a mouth ulcer I guess because of the acid. I might have 1 or 2 water flavors that I like well enough to at least drink some water. I struggled in basic training because we had to drink 2 glasses of water for each meal with the first meal at around 6:00 am.