If you do a spot of plumbing now and again, you can avoid torch, solder, and flux with Noble Copper-Bond Adhesive. Copper-Bond is a two-part epoxy made for joining copper water pipes. According to the manufacturer, the epoxy is made from "food-grade" resins and can withstand temperatures between 36° and 180° F, so it is safe for all domestic water lines. Copper- Bond comes in a syringe-type dispenser that reportedly holds enough epoxy to make 50 to 75 1/2-inch pipe joints. To test the epoxy, I "sweated" a few connections with the mixture, taking care to apply an even coat to both the inside of the joint and the outside of the pipe. The adhesive dried after about 20