“Woman gets help moving out of apartment crawling with snails.” Ok to be honest the pictures aren’t that helpful but I’m pretty sure they aren’t snails. Snails as far as I know have little shells on them. I would think more of a some type of mold or plaster beetle larva or maybe slugs of some kind.
Ok so as always we go back to the basic premise of pest control, identification is the first step. This helps to decide the course of action leading to sanitation, physical removal and application of control measures.
My first recommendation is you have to stop the water or moisture from getting in, then I would suggest home-sealing to keep the bugs from getting in.