Hello and welcome to basenotes!
This kind of hypothetical situation came up a couple of times in the last few months, check out the posts that come up when you search for " cheap favourites" "cheapos" etc!
Speaking from my point of view I'd go with 2-3 of my inexpensive favourites such as Cool Water, Rochas man and Victory league that could cover many situations however chances are pretty high that you end up shifting priorities a bit to have more money to spend on fragrances. Food for example is really loosing ground in my books
And to be honest, I dont feel as bad spening money on perfum instead of lets say smokes and booze (talking hypothetical, right ) which is what some others do.