If you can get a neighborhood watch going now, it will serve you well in that possible future event.
If things did get bad, single small family farms will be at risk just like in the 1800s only more so with the roadways and motor vehicles. You may have to be willing to double up with another farm family locally, because a 24-7 watch will be necessary.
Vets will be very valuable resources if that happens. They have knowledge about these things that civvies don't.
But I have hope with POTUS and Q that such a collapse has been averted, more hope than I have had in decades. If there is a collapse at all, or a cessation of services, I do believe it will be only for a short time. Everyone needs to have enough food and water and essentials (include any necessary drugs such as insulin) to go 90 days without resupply.
If you require refrigeration for meds, you're going to need some way to keep to make that happen. In the northern climes, a dug well can work, the water temp stays between 40 and 50. If you have a spring on your property put in a spring house. If you don't have those things, get one of the Coleman coolers that run on DC, a small photovoltaic panel and a single 12V deep cell battery. The Coleman DC cooler will maintain 40 F lower than ambient. Take advantage of any shade or dig down to put your cooler where the T stays lowest. Hopefully you can maintain the T where your meds will stay viable.