@maryelizabeth2. Welcome to Mayo Clinic Connect. We have a great and helpful group of caregivers in this support group. I’m sure they will have lots of advice and tips for you. I’m with your husband—I get so tired of pain water, so I found the following list:
The National Cancer Institute (NCI) provides the following list of clear liquids:
Bouillon.
Clear, fat-free broth.
Clear carbonated beverages.
Consommé
Apple/cranberry/grape juice.
Fruit ices without fruit pieces.
Fruit ices without milk.
Fruit punch.
Also, if Ensure is a problem, try freezing it and making ice cream. Or buy some full fat ice cream!
Have you talked with the doctor and asked what your husband’s options are?

Hi,
I sure understand the constant battle over food and drink. My husband has lost over 20lbs dealing with lung cancer. Any suggestions of food or water is not received well. We did decide to have him keep track of his calories each day and he knows the goal. But nothing sounds good, or he's full. The high calorie Boost has been very helpful.
At the end of the day we have to know that we have done the best we can. Praying that things get better. Hugs!

@maryelizabeth2, I'd like to add my welcome. In addition to sharing here with other caregivers, you may also wish to join bladder cancer discussions in the Cancer Support Group. Click the link to see a list of bladder cancer discussions to find the ones of interest to you and your husband:
https://connect.mayoclinic.org/search/discussions/?search=bladder+cancer