Al Netilat Yadayim or Al Tevilat Yadayim: Water Fit or Not Fit

Say al netilat yadayim even if you wash your hands by immersing them in a river, ocean, or other natural body of water.
Note Say al tevilat yadayim if the water is not fit for netilat yadayim (if it smells bad, is salty, a dog would not drink it, etc.). This applies to washing before bread, after sleeping, etc.