Water trickling in copper pipe can make soldering a joint almost impossible because you can't get the fitting hot enough. Stuffing a wad of bread into the pipe will absorb the water and you can get done before it dissolves. But use white bread; whole grains can get caught in valves. Before turning water back on, temporarily remove faucet aerator.
When shopping for a dishwasher, find one that features advanced sensors that sense and adjust for the amount of soil on your dishes, using only as much water as necessary.