I have a leopard gecko also and I just have a bag with calcium in it and I put the crickets in there and shake them around, don't worry they won't die just shake them. Along with the calcium he needs uv sunlight, I use a heat bulb that has uv built in. You could mix it in the water but then how is he supposed to get the bad taste out of his mouth.
I used to do the exact same thing with my pet frog.
That is called liquid calcium, and should only be used if your leopard gecko has metabolic bone disease. Calcium powder should be kept in a reptile dish, and also should be dusted onto its foods. Its diet should consist of crickets or mealworms, or both.
You can dust its food by putting it into a bag if it isn't already, dump a little calcium in the bag, seal it up and then gently shake it up so all of the food is powdered. Then you are all set to give your leopard gecko a supply of calcium, and crickets or mealworms.
No! Don't do that. The most effective way to get calcium into your leopard gecko is to take your crickets and put a little bit of powder into the bag, and shake it up gently.
The crickets should be coated in the powder afterwards. I also leave a pinch of calcium in a little dish in my Leopard Gecko's habitat.
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