Nothing to laugh about there at all. You are better using water like that than tap water. I always used reverse osmosis or purified water in mine. Chlorine will kill fish, so if your tap water is chlorinated, using what you did was a good choice. Its also easier IMHO to use bottled water when you do water changes. You keep the gallon jug in the same room and the water is at room temp and ready to dump in causing no shock to the fish.
Glad to here he is enjoying it! Fish can be a lot of fun.