If one didn't have access to a bike shop briefly what is the best chain lube available at say Home Depot ?

skate shop maybe? triflow

you can sometimes get the industrial tri-flow or the firearms tri-flow at hardware stores.

Probably not the "correct" lube to use but i've been using a Red Teflon Grease, the kind made for the hubs of boat trailers. My drivetrain is dead silent all the time. I scrub and re-grease every couple weeks.