Rainwater or stagnant water is best for watering. Be sure to put a barrel or barrel under the gutter. The water from the hose is cold and after such watering the plant will suffer a shock. I have two 1,000 liter barrels under the gutter to catch rainwater. If it rains, I also have free water. When I run out of water in the barrels, I fill them in the evening. The water heats up and I water it the next day. Some tap water also contains a lot of chlorine.