Bartering is the exchange of goods or services between two parties without the use of money. This is a very effective way of satisfying the needs of both parties when each has something the other wants or needs.
This gives way to thinking about what you have that you might barter with. When you're out there buying products for survival, think about buying extra items or special items that might be used specifically for bartering. This might be items that maybe you don't want or plan to use yourself, i.e., cigarettes or hunting gear, but would be desired by others. Of course, if you are not familiar with such products, you would want to do some research to find the best products with the highest desirability.
You would also need to know about 'shelf life'. How long can those items be stored without losing their usefulness. And depending on the item, i.e., ammunition, it might be wise to let only those people you completely trust to have knowledge of your 'stash'.
Automotive: gasoline, gas stabilizer, variety of engine oils
Personal: baby wipes, toilet paper, deodorants, toothbrushes, floss , band aids
Safety items: ammo, pepper spray, hunting knives, dog food
Repair items: tarps, duct tape, chains, rope, hand tools like screwdrivers and saws
When thinking of services or skills one might barter with or for, consider the following:
Sewing - any seamstress service, offer repairs to clothing or making new clothing
Hunting - those who hunt might use part of their kill of deer, rabbit, hog, squirrel, turkey
Fishing - offer fish, crabs, crawfish in exchange for goods
Carpentry - including repair and roofing
Auto repair - may require to have special tools, belts and tire fixes on hand
Blacksmithing - would require special equipment
When contemplating bartering, give thought to value for whatever you might be bartering as well as the item or service your are bartering for. You should try to reach as equal an exchange as possible so that both parties are satisfied.