I am planning on installing an outdoor shower near my swimming pool. It will be free standing and located about 20 feet from the house. The closest indoor piping for this would be from my kitchen. The house is plumbed with 1\2 copper. It is on a cement slab, so no under house access. The outside walls are stucco. Under the kitchen sink, the hot stub has a "Y" for the faucet and the dishwasher. The cold has a "Y" for the faucet and drinking water system. My question is: how best to tie into this system to get hot and cold water to the outdoor shower with the least amount of wall damage? All suggestions will be greatly appreciated.