Yes, you can easily use a 1lb Coleman (or Companion) gas cylinder for the HOTTAP. Just connect the HOTTAP to your Coleman 1lb gas cylinder using our Lightweight gas hose, and you're good to go!
You can purchase the gas hose here.
How long will the 1lb (0.45 kg) gas canister last?
The 1lb canister can give you up to 45 minutes of hot shower.
NOTE: The Lightweight gas hose doesn't come with the GASKNECT gas adapter. You can detach the gas adapter from your supplied gas hose (if you own a HOTTAP kit), or you can purchase a spare here.