The following is a sheet from a serious prepper friend. I haven't tried it yet, but he swears it leaves food that's fine to eat after five plus years. This friend is seriously prepared.
SECURE LONG TERM FOOD STORAGE
Place 3 light colored trash bags in a plastic bucket. Pour in 2 or 3 inches of the item being stored.
Place a 1"x1" cube of dry-ice on top of the food and so the ice won't touch the bags (some people place the ice on a piece of tile to avoid "burning" the food).
Fill the bags as full as you can get them and still get the lid on.Loosly tie the inner bag, wait 24 hours before putting on the lid or the bucket will explode from the trapped gasses.
Push the trapped gasses out of the inner bag, twist the bags tops into a rope and tie a knot therein. Tuck the knot out of the way, and do the same to the other two bags. Clamp on the lid of the bucket. Seal the lid with silicome if in a wet area.
You now have five gallons of inert-gas packed food, secure from water, insects, and rodents. But, the bad guys can still take it from you, or your house can still burn down, so.....
Dig a hole in the ground, fill it with buckets (80 is a pickup load), cover with plastic, and backfill. Replace the topsoil or it will show up on infrared.
HINT: if they can't find it, they can't take it!
If you don't want to explain to your kids and grandkids why they're starving to death, STORE PLENTY.
Bury by something you can find in the middle of the night, in Winter, during war, etc. You never know when you will need it.
Mostly store whole grains, and things ot make them taste differently. They are better for you, cost less. Your money won't go far buying freeze dried beer and lobster.
If the Egyptians could store wheat that grew after 4500 years, you've got it made. END.
A few thoughts on what he wrote: Avoid areas that could erode in times of floods. No creekbottoms. A place with fish and/or game for protein makes a lot of sense. I like the plastic 50 gallon drums with screw on lids. Date and write contents on each bucket (Duh!) A gun (heavily oiled/greased)can be buried in a peice of 4" PVC with glued on caps. Put ammo in a bucket. Nobody is going to move a pile of construction debris, rocks, bricks, etc. to look for anything, so that makes a good cover. I forgot to mention bears. They will climb cliffs, (learned this the hard way) trees, and dig deep to get to a stash.
Cheers, and keep your powder dry.