If it is the HCl or other acid salt, yes. If it is the freebase, no. Regardless, NEVER use tap water to dissolve drugs! The chlorine can react with the drugs, and destroy them. Buy a jug of distilled water from a drugstore or grocery store....
about 1mg to every 100ml of tap water try using alcohol, phenols are really good for that stuff. its like 10mg to 1 ml if ethynol