Tap water is the most accessible water for plants. It can be used for watering unless it’s too soft or too hard.

Softened water usually contains a lot of sodium. Over time, it can build up in the soil and damage its structure. It’s better to not use tap water or to filter it.
Hard water is rich in calcium and magnesium. They can also build up in the soil and create layers that repel water. Filter or boil this water and cool it down before using.
Chlorinated water is safe for most houseplants, but it’s better to filter it too.

Alternatives to tap water:

Rainwater. It is free from hard water elements and is the correct pH for the majority of plants. The only downside is collecting and storing it.
Bottled water. It may contain all the necessary minerals, depending on the source. Besides, it doesn’t contain chlorine or fluoride. The downside is the cost.

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