Water from a well will normaly be far better than any tap water simply because it is normaly filted through some kind of stone.But there is a down side to useing any water from outside that has not been through a cleaning process.Check the water to see if there is any insects or anything that can cause damage to the plants.Take a look at a sample through the same kind a magnafication that you would use to check the thc heads.If the water has any liveing organisam in it then i would personaly avoid useing it.........................tyke..................................................................................................