My no prep fast food alternative is pasta sauce in a jar (always have one on stand by) and pasta, with cheese and parsley from the garden sprinkled on top. Faster than getting take away.
I also like nacho - nacho sauce El Dorados, plain corn chips, cheese and chives from garden. Again faster than take away.
And I also keep a microwave packet of brown rice, lentil dhal and poppadoms in the cupboard. Sounds dodgy, tastes great and takes 5mins all up from start to finish.
Those are what I use to avoid take away on the days I truly can't even slice n dice.
I have other easy recipes for the days I'm tired but not completely out for the count, but even they require too much effort for the worst days.