I’ve never used dechlorinator before, but I’m looking into getting some since it’s a hassle to have to take extra store trips for spring water. I’ve heard people recommend Prime dechlorinator which I THINK is this, but please correct me if I’m wrong!

However, I have no idea how to portion it out for like one gallon at a time. It says use 5 mL for 50 gallons, and I don’t have a clue how to separate out 0.1 mL. Does anyone have any suggestions on how I could do that, or recommendations for other dechlorinators?
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Proud parent of 3 purple pinchers: Dr. Schmibbs, Tiger, and Cerulean :)
RIP to Marcel the Shell, Perry, and Sam