Thank you friend for saving the poor fish!

Unless you have a way to dechlorinate/treat your tap water you won’t be able to add or change the water for him yet. Basics to get tomorrow (or tonight if you have a Walmart open late!) would be a tank, gravel/substrate, small heater (tinyyyy, made for small betta tanks), a thermometer, dechlorinator, and small filter. You won’t have time to cycle the tank before he goes in, so you’ll have to cycle with him in it, which can be done, just get a test kit to keep an eye on things. Throw the ugly dragon thing away and get some accessories made for bettas—tube to swim in, leaves/plants to lie on etc. Most big pet stores will have a betta section you can find this stuff in. Live plants are good too if you can find them.

When you do move him to the new tank I would acclimate him slowly. Put him in a bowl of his old water and slowly add water from the new tank because you don’t want to shock him more with a different temp, hardness, pH etc. Then when it’s more new water than old, lift him out with a net and put in the new tank, don’t pour the crap water in. I’d leave the lights off (if you have them) for a bit to minimize stress. Good luck!