Fighting the Hordes in the World Beyond
How do you kill a zombie?

Techniques vary from one citizen to the next. Everyone agrees that fresh water is a great weapon for destroying them. To be effective, however, it must be used to fill plastic bags thus making Water Bombs.
Alternatives
If you feel so inclined, you could also try:
a big wooden stick... it's not great, admittedly
a water pistol! Job done!
a well-trained pet
other fun toys...
If you're in too deep, and there's no other option,flee...