Soldato
Piping is fun. Modern compression fittings or solder ring are so reliable and easy to apply. Difficult to go wrong really. So are push fittings. dLockers is right, any copper pipes buried in the wall or floor must be wrapped in something waterproof if the area is often wet. Pipes will rot out very fast if not. Depends how wet the wall is but in the worst case Denso or Petro if you want to do it on the cheap, messy though, and conduit pipe if you don't mind spending a little more money.