Is my CV joint finished ?

So say 3 weeks ago, I tore my CV boot(smaller then a dime), but replaced it with a universal boot from Royal Distributing before shtf as I’ve done that once before.
I’ve been riding for the past 3 weeks with no problems, but after a 80km road ride, with some water at the end of it, I noticed my boot slipped off and there was no grease in the boot. Not sure as to how long it’s been off, but couldn’t see any mud as I was in the lake a little bit.

Providing there isn’t any clicking, or visible damage, would it be okay to clean it out, refill with grease, and reclamp ? The clamp they provided was the shits, so I’ll be looking for something a bit better.

Sorry if I rambled, thanks in advance,

One