Personally, I would try to blend in with them, do the whole moaning, craving for flesh doo-dad and escape through them - i bet they wouldn't notice. Then i'd go and, hem, buy a gun of some form - with cans of beans stolen from the supermarket next door, take out all the ammunition i needed, then wheel my trolley to safety.

Hey wait, are these your conventional i'm-going-to-go-real-slow Zombies *plod plod plod*, or like in 28 days later where they run like they're on fire - oh good one! i'll get a flame thrower too. (too much time splitters)

If they ran like the clappers, i'd probably steal a flashy car too then magically learn how to drive in under a minute. This could prove a pretty interesting life... let's revive dead people *starts in the ff7 forum*