could water be my cure?

I've been on Humira 10 months, 6mp for 7 months and occasionally I had feelings of remission until one day the pain got really bad. I was in tears and realized I havent been drinking enough water. From then on, I went to a MINIMUM of 4 poland spring bottles of water (sometimes more), within days I noticed a huge difference.

Is it entirely possible my Crohns/fistula problems arose from constipation and lack of water in my colon? I have 2 normal bm's a day and stomach is not distended anymore

I've never heard of a fistula being caused by constipation. Never.

Still, if the water is making you feel better, carry on drinking it. I should drink more water. One of my kidney bloods was a bit high and I often feel dehydrated :/

Water can absolutely make a big difference! I think some of the negative reaction above may have come from using the word "cure" in your subject line. I try to drink at least three 16oz bottles a day, usually more. It makes a big difference in how a digest food and how it passes through me. In fact, I did have a recurrence of an old retired perianal fistula back in January caused by constipation in late December. Holidays got me out of normal eating/drinking habits. I wasn't drinking enough water. Had a really bad bout of C with a lot of straining. Finally got it to pass, but within a week developed an abscess and the fistula re-opened.

Staying hydrated is important for us. But a cure? Nope, not even close.