IMC, the party has no cleric, no druid, no bard or anything...they simply have no acess to divine healing at all, and they're doing just fine.
I have a monk, 2 fighters and a ranger (who took the non spellcasting option from CW)
They're now 8 level and no one died up to now. They may have had like, 5 potions of healing during all this levels, but mainly they have to make sure they stay alive, cause generally there's no more healing than a few night's sleep.
I'm not an easy DM (actually I'm a bastard), and I have put them trough very hard fights, I have not fudged dices once to keep a player alive, and if I have to, I'll kill them without a second thought.
Not to mention the time they all got that disease from dire rats, and stayed in bed for a week.
The secret is to use good tatics, be afraid of what can kill you, use combat expertise to it's maximum almost every round, not let yourself be flanked, and, if the situation demands it...RUN!
It can be done...nicely done actually...and my campain is a living proof of that