What things do i need to raise a mexican fish, where can i buy the fish and things, and how much would it cost?

I just need to know what things do i need to raise a mexican fish and where can i buy the things and the fish and how much would it cost.

My brother wants one and i just wanna see what i need and how much would it cost and also what kind of food they eat.

I’m talking about the mexican walking fish/axolotl

Thanks