I don't agree with the whole skimping-on-small-things thing, but I work at home and don't eat out that much. The "how" seems pretty straightforward: either buy groceries at a grocery store or have them delivered. I have a fresh vegetable box delivered every week. "Getting out" and "winding down" don't require eating out.
I stopped eating out completely and stopped ordering food in. Bought a freeze and canner and meals are quick and cheap to make with better flavour. I stopped getting sick.. think back to all of the times you got really sick from food. I bet you most of them were from food you didn't prepare yourself.