Whether it's chicken pad thai from Green Peppercorn or leftover charcoal chicken from EJs, I often wash and reuse plastic takeaway containers for later. I'll throw out the container if it's oily or broken.
They're especially handy when after a party and you want people to take home leftover cake or nem nuong.
Sounds tightass but I like to think that reusing/recycling is better than going to landfill.
Spring onions and some herbs. Sometimes when you buy some veggies from the supermarket, they leave the roots on. Just pop that shit in a bowl of water and change water weekly. Haven't bought spring onions in months.
It works for things like lettuce, celery etc but takes a lot longer.