Really need advice on a plastic tub setup! First time for me.

[Blizzard]

Hey! Hope everyone is having a good day.
I am about 88% sure I will be purchasing a baby lesser 66% het pied from a Breeder, but currently do not have quite enough to splurge on a tank right now and will wait until the future for that, perhaps when he gets a little bigger. I tend to enjoy tanks because I like to watch my snakes doing their weird stuff.
Ahem, anyways, I will be going with a tub setup for this little guy. Problem is, I’ve never done a tub setup before and would really like to make this snake’s home ideal but I also don’t have a super high budget, so I would really appreciate some advice on: what is the perfect tub setup for a baby ball python? Possibly cheap? What is everything I need?

I am also worried about temps, it’s easy for me to gradient a 20 gal tank, but how do you do that in such a small area like a tub? Any advice on that or really, is there anything else I should know about keeping a BP in a tub?

Thank you you all so much, I really appreciate the people on here willing to give their time to help others with their questions, you have helped me with many of them myself!