need help calibrating some liquid

After years of searching I finally found good quality LSD in liquid
form. I need to dilute it though because a single drop is far too strong
for me. I learned from A. Shulgin that tap water is a bad idea because
of the chlorine. But what kind of water would be best? Deionized?
Reverse Osmosis? Or is there something better than water? I had such a
hard time finding this I would really like to preserve it for as long as
possible (hopefully for years). Currently it is completely away from
light and in my refrigerator.

Thanks in advance for your recommendations.