This is the easy guide to joining the waste-free revolution.Internationally, supermarkets are axing free plastic bags and others are starting packaging-free aisles, and restaurants are getting rid of single-use cutlery and straws.The zero waste movement has followers around the globe and is championed by millennial role models such as Lauren Singer (nearly 300k IG followers) and Kathryn Kellogg (90k IG followers).Nearly 3 million Instagram posts are tagged #zerowaste.The zero