...I would be planting one plant per container but my plants are greedy lol. I would not put more than three in each thats for sure.
Hey, Nova, I thought you were one of the 'clumper' advocates? Three would be a good clump, eh?
With that many barrels, you could experiment, 1, 2 or 3. Don't know the bhuts, but I'd put 3 jalapenos in one pot. Who knows, on those hot dog days of August in Missouri, the extra shade from the crowd might come in handy. And provide mutual support in a storm.
RobbyJoe hit a good point: if you are planning on over-wintering, you prolly should stick with 1 for the most part.
For soil: Keep it light as possible. Silver Surfer has a good recipe: 5 gal peat, 15 gal pine bark fines, 5 gal perlite, 2.5 gal composted chicken manure, 2.5 gal humus, 2 cups dolomite lime.
Since you got plenty of barrels, consider the one Duane and Sorellita posted: put a couple of chunks of concrete in the bottom for ballast and fill container with Pro-Mix BX. Fert with time release Osmocote. That would be pretty light. Could mix in some compost for more nutes, too.
Good luck and keep us posted....