Don't: Use Plastic Food Storage Containers
Plastic may be versatile, lightweight and cheap, but some types of plastic also leach chemicals into foods. If you're keeping some plastic around, purge anything marked with a recycling code No. 3 or 7 first. Those numbers are used to mark hard plastics that often have the hormone-disrupting chemical bisphenol-A. Whatever you use for food storage, avoid microwaving or cooking in plastic, and avoid using plastics that show signs of age, since these conditions make chemical leaching more likely.