Getting alcohol into theme park

It’s a theme park for (mostly) adults. We are not with kids or anything of the sort. It’s 6 flags. They sell alcohol but I’m not trying to spend 24$ a tall can, it’s my birthday. I don’t get queasy on rollercoasters & am in no danger of throwing up no matter how drinky I get, promise.

I just wanna know the best Amazon tools (i.e fake tampon packs, water bottle full of vodka, etc) to get some booze in for a full day)

Side note; every time I’ve ever been to this theme park, their security is lax at best.