You can't use the worm drive clamps but you also don't need the Pex crimp tool (although most rental yards do have them for rent). You can use reusable fittings such as Flair-It or
Seatech. My Suncruiser came with the Flair-It fittings and Tiffin Motorhomes uses the even better
Seatech fittings. No tools at all required for these and you can remove a line from the fitting with 2 fingers if needed. You could stop at any RV dealer who handles these brands for fittings and/or tubing. If you have a few of these, some memnders, and a hunk of poly line you can handle any on the road emergencies easily and by yourself.