One time I flew to Chicago with a cooler full of food to avoid throwing it away before a trip. We were supposed to have a party, plans changed, we had to leave town and yet still had the makings for a fantastic appetizer platter in the fridge. No wasted-food-guilt for me, off I went with an extra carry-on in tow.
Since then, I've realized avoiding food waste starts in the grocery store. The smarter you are about a few important rules while shopping, the less food you'll waste. And less wasted food is good for the planet, your wallet, and your peace of mind.