How do you solder copper pipes with water in them?

I had this dilemma happen to myself. There are two options to assist you. I purchased a small wet/dry bucket vacuum from the Home Depot $20 has plenty of power. Take a copper fitting like a coupler or 90' elbow and tape it around the vacuum hose. Place the fitting over the copper pipe and vacuum all the excess water out. You can hear and see the water hose pumping water. Leave it on for a while until it pulls the water from the lines. Now your ready to solder. Use lead free solder it works well to with a little water. Option two , they now sell fittings which require no soldering by Shark [brand name] sold at the home depot a really good product, just a little expensive.