Kevin,
I'm no expert but I have used an MSR gravity filter for about three years now and wouldn't use any other system. If I think the water is going to be real funky I bring some tablets but I have yet to use them.
FWIW to you.
As far as gear improvements I need to replace my tried and true Keens as my go to shoe. The quality just isn't what it was and they come unglued before hunting season even starts. Fuggin' lame.
Everything else I'm happy with right now. Especially since I switched to the BA sleep setup with their big ass Q Core. Heavy, but I don't give a schit.
Travis