What is a good homemahomemade weed killer?

Mix salt and vinegar, spray or pour it on when it is dry and wont rain for at least a day. It really works and is safer than most off the shelf herbicides. If you want to go nuts - put a big pot on your barbecue grill (outside for ventilation) and heat up a pot of vinegar and a little water, pretty hot, but not boiling - keep adding salt and stirring in until it (salt) wont dissolve anymore. Let cool and now you have a concentrated mix. Tip: use water softener salt from a hardware store - its a lot cheaper than table salt from a grocery store and works just as good. Buy vinegar by the gallon at a bulk foods store.