First and for most you need 2 tanks. And if you don't want to spend the money 6 qt will work find til about 250 gram then you need to upgrade to a 15 or 16 qt tub, but it really all depends on each snake.
You will need each one of these things twice b/c u have 2 snakes:
paper towels for bedding as babies
UTH (flexwatt or zoomed)
Hide
water bowl
(no light no eco carpet)
THERMOSTAT!!!!!!!!!!!!!!!!!!!!!! A cheap one is the Reptitemp 500R and it has 2 plugs to work both snake tanks