Is this from the coffee?

So my story is that I had a total colectomy so I have a temporary stoma until my takedown that will most probably be scheduled in April or May. 
 
Soon after my surgery, I have had dehydration problems and have gone to my GI to get an IV, but I got used to drinking water and stuff so everything 
actually calmed down.

I love drinking coffee and I've actually been withholding it for the longest time when I had UC. Since my surgery, though, I've been trying out coffee here and there but in small amounts and always with milk and syrup (at Starbucks). 

From about a week ago, I started drinking coffee every day (Tall size). Sometimes 2 cups. Sometimes they are very sweet drinks and sometimes they are just lattes.

Since then, I notice that I'm always always so thirsty towards the evening. I drink the coffees in the morning or at noon. Towards the evening, I become so thirsty that I feel like I can chug down a whole gallon of water or juice. Even if I drink a lot of water, I still want more. So I continue drinking.

I do go to the bathroom to pee but I notice that as much I'll feel like I need to go, that not much comes out every time I do but that especially tonight I had so much brown water come out through my stoma. I had to empty my bag like 10 times tonight. I also noticed that much more mucous? comes out of my bum more so than before. 

Is this all due to the coffee.....? I have never been so thirsty in my life.

Hubby's first visiting nurse stressed...it is ok to have your coffee but follow it up with equal cups of water to offset the dehydrating aspect...hubby only has one cup in the morning and maybe one in the afternoon here and there so with all the water he drinks so far he has not had an issue. We live in Fl and do a lot of travelling to hot climate areas and I am always reminding him if he forgets to have water on him.

Yea, my hubby is addicted to his coffee as well.  We seem to be fending off dehydration by 1. him drinking a ton more water and trying as much as possible to lay off sugar and 2. electrolyte pills ... I could not for the life of me get him to drink electrolyte water or supplements... he thought they were incredibly gross... but the pills have been a Godsend.  He had to go to the ER once for dehydration but this was before we started using the pills and cutting down the sugar.

It sounds like it is coffee causing the higher output/dehydration. It can be difficult to figure out what your body can tolerate but it sounds like 1 may be your limit for now. You may want to just have coffee (not a latte) and add your own sugar instead of their syrup. That way you can control the sweetener and milk. Remember that artificial sweeteners can cause issue for us, too.

I know if I drink a Latte it will have a quick transit time...but I can drink coffee that I sweeten and add milk to without an issue. We are all so different and sometimes it just takes a little trial and error to find what works best for us. If you like it, find a way to enjoy it!