What should I do with my old moon water?

If it's water you left sitting out to catch moonlight, it's past drinking once it's has stood more than a day or two — bacteria grow in it well before you'd notice anything by taste or smell. Pour it out, wash the jar with hot soapy water, rinse it, and keep it for storage rather than for drinking. If it's already been in the fridge overnight and you drank from it in the last few hours, no action needed; if you drank it and now feel unwell, that's a doctor question, not a card question.

If it's a jar you've been topping up for months, same answer — empty it, clean it, and if the "moon water" is something you like doing, keep doing it with fresh water each time.

One thing I'd check honestly: if you're asking because you feel uneasy about what was done with the water or about doing it again, tell me and I'll pull three cards on that question — the disposal itself doesn't need a reading.