My Minimalist must have list... in no particular order. A floating rapala. Maybe a jointed one.You could also try some top water lures, there are a lot of different kinds, for many different purposes but the must universal is the popper.
a crank bait or two... personally, I am a rebel fan... if you can find an old deep wee r, you are set...
a couple of panther martin spinners, a mepps comet, Aglia and Aglia long.
A buzzbait.
A Johnson silver minnow. A daredevel. (Not an imitation) a mepps Cyclops and a little CLEO.
A headon torpedo, a jitterbug, a hula popper and a plastic frog. A couple poppers and a deerhair popper
Plastic Worms, worm weights and worm hooks... (read an article on how to use them)
Then... go forth and multiply...