HCA: Hermit Crab Association

I've finally run out of the first little bottle of water dechlorinator I got and ordered Prime because I've seen so many people recommend it here. The ratio written on the bottle is for large amounts of water but I only need to dechlorinate 3 or 6 cups at a time (3 cups for each dish). I tried to search and found questions about doing a gallon at a time but was curious if anyone uses it a cup (or 6 haha) at a time? Or maybe if anyone better at math than I am can help me convert the dosage lol.
Thank you!

I mix a pitcher of water whenever I need one, and then use the leftover on my houseplants and dogs.

Or you can get a gallon of water or two from the store dechlorinate them and use what you need then store the whole jug under a cabinet somewhere... If that's a possibility for you. Just the easiest thing for me!

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Yep, I do the same. A gallon jug for each. Just makes it easier than to make them every time.