Sea water- Water from the sea is best for cleansing and healing rituals. It's also great for banishing and protection spells!
Storm water- Spells and ritual that have to do with emotional strength, confidence, charge, and motivational force. It's known for strengthening spells. It's great for curses as well.
River water- Spells and rituals that have to do with moving on, focusing energy, breaking through rough paths, and warding. Great for powering tools.
Rain water- This is very multi-purpose, but especially good for growth and rebirth spells. Great for spells you want to keep gaining power over time.
Snow water- Great for spells and rituals that focus on purity, endings, and change, as well as slow working spells.
Dew water- This is good for love and fertility spells, as well as delicate magick. Great for if you work with the fae.