DIY pedal drive recommendations?

  Oh,,, when I think of the pain you will go thru..     

Haha! Didn't say I was going to build a paddle wheeler, just curious. But, supposing I wanted to float down the Missouri River...

Tam Sawyer and Huck Finn it. Raft and a couple of poles. Add a handline and your set

Google “hand operated propeller” for another option.
They also make hand props that connect to a cordless drill, like this: https://www.walmart.com/ip/Drill-Paddle/106288096

Google “hand operated propeller” for another option.
They also make hand props that connect to a cordless drill, like this: https://www.walmart.com/ip/Drill-Paddle/106288096

my friend bought one of those prop drill things, and all he did was go in circles lmfao...