Zakum

You'll survive most likely, Zakum doesn't attack (often, maybe a couple times) in a party for some reason, so just don't go run into him, and you should be safe. When I last went in a party, he attacked maybe a couple times, so you could just hop on over to the summons and start tanking. As for where to be, try and hang on the left rope, so you aren't pushed around all the time. Potions should be something that can heal you completely because you probably can't take a hit and heal a couple thousand and take another hit. If zakum only did 1/1, then any pot is fine so long as you aren't at 1 HP at the 1/1.

But to be on the safe side, level as much as possible and see about HB. I can't give zakums damage out, because I get hit for barely anything due to my high defense.