Barberry, berberis, berberine foods/confusion and D Mannose for UTI's.

Hi,

I am having the beginning of a UTI.

I am getting confused between:

Barberry (a plant which contains berberine, berbamine, oxyacantha and tanines.)

Berberis ~ an evergreen shrub. https://en.wikipedia.org/wiki/Berberis
 which contains berberine. and then there is

Berberine as a stand alone element. I don't understand if I can only get berberine from  Barberry, or whether I can get it in other plants, like berries for example.

I am also reading about D Mannose and it seems it is in cranberries and blueberries but I would like to know if it is in other foods also.

haha, I hope that made some kind of sense. I can't even find where I just read about berberine in the first place as helping UTI's. I may be totally off on that. >< Any ideas kind people?

Ps, I also just started drinking dandelion tea a few minutes ago as I read that can help too. Also I'm taking epsom salt baths every 4 hours or so. Cheers