UVA URSI is not acidic. I, like you, have fought this particular problem, I was even prescribed macrodantin daily for years back before they really considered antibiotic resistance. When I was a teenager and too poor to keep going to the doctor, and cranberry juice became too acidic for my stomach I started drinking the uva ursi tea. Then I could only find it in powder so I would mix it in the boiling water (resembled a nasty swamp) and down the hatch it went because it helped. Leaves are definitely better. Lol
The cranberry supplement is just fruit and it does not seem to upset my stomach if I take it at night.
Maybe some other folks will have some other ideas too.