Wands. You (or the rogue) don't need to be a dedicated healer, but some ranks in UMD can provide emergency and out-of-combat healing.

Preventing damage in the first place is also a good tactic. Play some sort of buffer to increase attack, damage, AC, saves, damage reduction, miss chance, fast healing. Bard, marshal, dragon shaman come to mind, but full casters also get good protection spells.

Potions, of course. Get a few for yourself.