Are you in America? Excuse the answer, but I'm serious. If so-

Water purifier. Big ol' clean metal barrel will do. Preferably not aluminum. Get a filter or make one with bags of clean sand, rocks/gravel and charcoal. Get a lot of charcoal. Rain catchers.

Vitamin and nutrient supplements. Iodine. Prussian Blue. Bleach and disinfectants, masks, gloves. Depends on what you feel would apply to you. Plus they're cheap.

Garden implements. Fertilizer (for gardening, silly.) Tomatoes, onions, potatoes.

(In spaces without dedicated growing spaces you can order indoor grow kits. You can grow more than weed indoors ya know. Combine that with tinned food and you're set.)

Self-defense. Martial arts, a knife, a gun, trapping, etc.

Start talking to others in your community. Not even for the sake of bonding; but knowing who is around you. What their beliefs are. If they are armed. Bond and start talking about community plans with your neighbors and trusted community. Otherwise your investments won't mean much when shit hits the fan.

Most of this is based off the assumption that you want security. Finances, yes, but those finances and investments are for emergencies I imagine. I'm telling you dropping that mindset is better and to invest in things that will make you far more valuable than gold in a shit situation.

You want a physical asset to hold onto? Toilet paper. Not joking.