As much as I sorta kinda hate to jump into this discussion...and there is no scientific evidence I can cite for the following, I just gotta throw in here:
I have a neutered male cat that is probably about 10 y/o now (he's the one that was left anonymously in my car in a cardboard box while I was at work at the age of what was probably about 3 wks (his, not mine)). I kept him (of course) and had him neutered as soon as I could, at that time it was recommended @ 6-8months. W/in the 1st couple yrs of his life he had problems w/crystals. He would strain, bloat, blood in the urine, etc. He went back & forth to the vet & had several catheters. If I remember correctly at one point she said she actually dilated (excuse the following graphic un-medical descriptions) his penis and that if that did not help she actually recommended amputating his penis in order to enlarge the opening. I have no idea what kind of crystals these were. For a while he got $30/box wet food, I think it was m/d but it was a long time ago, but there came a point where this expense was just not feasible. He was never amputated.
Anyway the rest of this long story short, I finally switched him to 9-Lives Plus Care (yes, I know, it's kibble but Tink & Tawny don't get near it) and he has been fine for many many yrs on that. But if the store is out of it and I have to feed something else, I notice him straining. I buy the big bags, they run between $10-12, and all my kitties that don't get the wet (that would be Tink and Tawny) get this. 9-Lives Plus Care is designed for urinary tract health (or so it says on the bag).
You mentioned your friend's budget, so this might be an option for her to try/consider. There seemed to be some conflicting advice above re wet vs. dry, and I am not saying one is better than the other, I am just saying this is what has worked for Buck and all my other dry-fed kitties for years, and I have more males than females. With 16 cats it is impossible to keep them all on wet food, so this is what we do.
& one last point: I later heard that male cats should never be neutered before the age of 1 year, that if they are neutered b4 that they are not fully developed in that area and that can therefore cause problems w/crystals. I have no idea if there is any scientific basis to this or not but I do not neuter any of my male cats now before that 1 year mark, just in case.
I gotta tell you, tho, I had a devil of a time keeping my last rescue--Angus (yes, he is named after one of the founders of AC/DC b/c he was rescued on the day of their last New Orleans concert I didn't get to go to) in the house until that 1 yr mark tho!
Just wanted to throw all that out there....
Desi