The paper bag lining is pretty easy to do....I use Elmer's Carpenter's Wood Glue, and a not so good paint brush.  This will make a good brush not so good after you are done!  Make a mix of watered down glue in a shallow bowl.   Have a puddle of glue for dipping your brush into.  Rip up a brown paper bag into irregular pieces.

What I do is take the undiluted glue and brush it onto the inside of the gourd.  Work with small areas of glued surface. Then dip a piece of paper, or brush on the water/glue onto your paper. Add paper to the inside of gourd slightly overlapping. This can become messy! So have a wet washrag to wipe off your fingers!

Apply the paper to the gourd and take a stiff brush (and fingers) and burnish (rub firmly) the paper to the inside of gourd. Then repeat over and over!   After this has dried over night, I apply either Instant Decoupage or Delta Ceramcoat Varnish. Both are water based. The Decoupage says its a Glue, sealer, and varnish.

I guess you could use the decoupage in place of the wood glue. I use the wood glue because I found that once you glue something with this stuff it never comes apart!