Does hoa allow for a greenhouse? Cooking for that many an issue, we use 50 gallon drums cut down to 3/4 height and weld on 3/16 bottom ss plate with dry sand I between it spreads heat better and you can put a bar through it to move . Hot water wi be issue, the amount of material required to heat it will be point of conflict, only wood as other heat sources will be irriplaceable.
Get some snare wires end crimper and wire loops. Get strong enough to bring down elk. Frees up foragers less noise no gun shot to bring unwanted attention so does cooking smells wood smoke.
I don’t know how far away each person is bUT the farther the less likely to make it plan accordingly.
Can try to get everyone to bulk buy items they already use, save the leftovers for just in case. Play a game of conflicted with them it makes people think and once question asked mind will have to answer it even if it is with delusion.
If your river has descent flow look up a ram pump saves on caring water. Also can your septic handle that much more? If not a least look into outdoor urinals for the men to shorten lines.
With beds remember not everyone will sleep at once will need 24 hour security.
Will hoa allow chickens?
What is the threshold for violence? Lethal violence? How to deal with neighbours after such event. How does inside group rule differ from the others make sure everyone gets it and have punishment stated and prepared. confining someone wastes more.resources and man power.
Do you have board games and lots of playing cards cheap games at thrift shop cards.too but will be rare after.
How will you stop neighbours from contaminating river? How far will you go?
How do you treat so much drinking water for everyone? How much bleach do you have for cleaning? Where will you dispose of animals and other dead things?
How much quicklime do you have?can you make more?
Got sandbags and a place to fill them?
Does river have a dam upstream? If so what happens if it breaks?
Sorry not many answers just more questions for you