I just use regular tap water with some "Aquasafe" dechlorinator. However any dechlorinator will do really, if you live near a Wilkinsons that's where I have seen it the cheapest.
There will be instructions on the bottle. While you're at the store, look for test kits for ammonia, nitrite (NO2), and nitrate (NO3). Basically, you want good bacterias to build up so they can break down the ammonia that builds up from poop/pee. Since you've set up your tank recently, there won't be much good bacteria, and so your tank might get too much ammonia. Test for ammonia, and do regular water changes (about 25% of the tank water once a day) until there is no ammonia in the tank. Once you get to 0 ammonia, you should only need to change water once a week.
(Make sure that the new water is around the same temp as the tank water.)
Let us know how it goes, and what other questions you have along the way.
Please, I am begging you, do not use gravel as a substrate. Axolotls end up ingesting the gravel as they are sucking in their food, and the ingested gravel leads to very serious health issues.
You will save you (and your axies) a great deal of stress by using sand or a bare bottom as a substrate.
Hi Harry,
we got our axie from the same shop. As it happens we saw your 2 the week before you bought them, we have a picture of them!! They were obviously very easily distinguished, I thought they looked like they were in drag!!
Dan, in my experience the paws for thought on York road always has a decent supply of axies, these 2 were the 1st full adults I have seen there, the majority are juveniles.
Enjoy
It looks like they are trying to morph, might be tiger salamander