Ok friends, I have a question about long term storage.

I have secured several barrels from a local person who gets them from Armor Meats. They are fantastic barrels; they're 50 gallon black plastic, very very heavy duty with a lid and seal ring much like a canning jar.

They were used for hog casings and I washed them out and they're squeaky clean inside. I intend to use one for long term water storage (for emergencies). My question is what do I need to do if I want to fill one up for long term ammo storage? Anything special?

I would buy a combination of one gallon and individual water bottles, and place them inside the plastic barrels.
Store bought water should keep ok for at least 5 years or so.

And it will be easier to use and transport than just barrels full of water...

As to the ammo, I would store in in military ammo cans, and place them inside the barrels.

Again it is easier to handle it that way.

Also, I recommend you keep the ammo indoors.

Extreme cold and heat and moisture are your worst enemies.