Check out “Alternate 1” under the power section here SparkFun QwiicBus Hookup Guide - SparkFun Learn for a quick rundown of how to power the system @ 5v
It’s not entirely clear to me whether a midpoint is required or not, so I’d probably grab the kit instead SparkFun QwiicBus Kit to ensure if it is needed I’d have one…the part in the hookup guide about needing to open the bypass jumper on the midpoint makes me think it might
Update This thread describes how someone connected 2 endpoints…but frankly it still seems easier to get the kit to me and just use the MP too for simplicity’s sake