Alternatives for weed/grass executioner? Does anyone know of any combination of ordinary products you find in...

Does anyone know of any combination of ordinary products you find in your home explicitly a good weed/grass killer? Weed/grass killer that you can buy are so expensive.
Answers:    I agree that vinegar works but be careful. I poured some on a weed and the very subsequent day it was gone but so be the grass that was underneath it. I used too much so try a 1/4 cup or even dilute it and experiment so as not to kill your grass
vinegar works wonders, really works