Sorry you are struggling so much. Do you keep track?
When I first got home from the hospital I had 1oz cups they gave me. As I drank them I kept a tally and made sure each day I beat yesterdays tally. Even just by 1 oz.
4 weeks out, are you able to tolerate bigger drinks? More frequently? You really have to stay conscious of it at first and then it becomes habit.
By the time I went for my 2 week follow up I was hitting my fluid goals and they were amazed and said most patients don't hit goals that soon. I was determined because I get dehydrated fast when I am sick and I didn't wanna deal with that. I pushed hard and like I said, keep track and make sure you beat yesterday tally each day and suddenly you will be there.