Difficulty with drinking

16 years old, depression, OCD, ED Taking sertraline, depakine and some vitamins and iron (I think) Issue with not being able to drink enough because of aversion and nausea I've had this issue for a good while. I try to drink more, but I just don't feel any need to. I'm almost never thirsty and even when I'm pretty dehydrated, I take two sips and done. I can't force myself more. I always get so nauseous, I don't vomit, but it's really forced and I feel like I can't swallow. It's especially hard with swallowing medications, I always feel like I'm gonna throw up just when the meds and water touch my mouth. Soups don't really help, it used to but it's basically the same, I get aversion and nausea and can't finish. Eating is fine. I can drink some flavored stuff, chocolate milk, soda is easier but still won't drink it even when the bottle is next to me, coffee which is dehydrating and that's basically it. I have limited resources, I'm at a mental hospital but I keep forgetting to tell this to the doctors and idk if it's even nessesary + I don't wanna end up with IV. No headaches, no fainting, I feel completely normal, even when I drink like half a liter every day with light to moderate activity. And flavored stuff isn't really the solution too with my stupid eating disorder.