I have an insulated cooler, that our milk man left with us, when we decided to buy our milk at the supermarket.
I keep it stocked with bottled water, small cans of Coke Zero, and Pepsi Max.
In addition, I have 3 ziploc bags with a variety of small snacks like Oreos, Cheese&Crackers, and Oatmeal&Pnut bars,
and I keep the whole kit in the back of my truck when out on inspections lately.
I’ve had great luck in offering it to my clients, and they’re really appreciative, and thank me profusely when done.
It’s been one of the best “little things” that I add to my inspections.