First priorities involve a supply of food and water. Don't underestimate how much water you need.
Canned soups are great for this, plus lots of cases of water. Bags of beans, dried rice, or nuts are also good here. Don't forget pet supplies.

Next priority involves water filtration (lifestraws for example) and basic medical supplies, and active/passive temperature control.

After that, focus on digital and data security. This involves making offline backups, but also backups onto one's phone (which is a low power device). Make sure you have everything you need to keep advancing and doing rituals! This includes astrological data of future years.

Beyond this, there are many issues that need to be addressed, but take things one step at a time. Don't forget the power of magick in securing the wealth and safety of you and your loved ones. For example, one can start a sun square soon for health or prosperity.

Don't panic, as the Gods will help us. Just don't make your situation so dire for yourself. Start now while there is time.