Halloween // Pepto Bismol DIY?

I've never DIY'd a Halloween costume before, and this year I wanna start off early to make sure I finally do one of the many ideas I have and leave to dry each year. Basically, I wanna dress up as a huge bottle of Pepto Bismol, and from what I've searched, it seems there's no existing template or anything, so I'm curious as to how I sh/could go about making a costume of a Peto Bismol bottle since DIY seems to be my only option.