SharkBite fittings sold at Lowes, Menards, ACE Hardware are water fittings that just push into place and lock on your water lines. Say you wanted a shutoff valve to your stool. Just cut the line square and push the SharkBite shutoff valve onto each end ... you're done. There are other brands similar to the SharkBite brand that work the same.
http://www.supplyhouse.com/SharkBite-Fittings-595000