I use the primer along with the glue.

The food tube is a 4"x2' length of PVC pipe that has the flat cap on one end (there are flat bottomed and the curved caps) and a sewage access (threaded) plug on the other end.

The threaded cap can take some significant hand grip and strength to screw in tightly and to unscrew it. You might try cutting a rubber gasket to place inside the access port. That would provide a better seal and should require less effort to seal and unseal the fitting.

I used some stout wire ties at each end (wrapped around each end just inboard of the two caps) along with "easy links" to attach a shoulder strap.

I roll the food tube inside of my sleeping pad and then secure that at the bottom of my ALICE pack,,,or I can carry it as a single piece of gear, using the shoulder strap.