Ouuuuuu!!! A thread topic that I literally look into every week! Pinterest is a great resource for ideas.
Long-term sustainability is only as good as your security and environment. Much like crypto, you should always have an exit strategy and since you are in Atlanta, you should have a way to get out if shit hits the fan (SHTF).
What I would look into:
Water is super valuable and not just for consumption. With your stream behind you, if you have access, I’d look into creating a micro-hydro electricity generation using the stream (you can get parts from an old washer that someone will throw out). Even if you don’t have access, you might be able to conceal it. (Not sure if you are already doing this)
Buy in bulk and store it. You’d be surprised in what lasts a long time.
3. One man’s trash is another man’s treasure
Take a second look at anything you or your neighbors are about to throw out. Milk jugs (great for grabbing water on the go), washer (parts for a hydro generator), straws (jam them full of cotton and seal the ends for fire starters. Also great for storing seeds.)… literally almost everything can be used for SHTF items.
Look on craigslist for used book bags and then create a 72 hr bugout bag for everyone in the family. (including the little doges).
A simple stupid bandage tin that someone put in my xmas stocking that I converted to a bugout bag emergency tin. Straws have been sealed with cotton, aluminum (for starting fires), and needle & thread (very important).