Not so long ago, it was common practice to use plastic plates, cutlery, and straws when hosting a party, and throw them all away afterward to reduce clean-up. Bottled water was in vogue, and everyone had a huge stash of grocery bags stuffed in the cupboard below the sink. Tupperware, saran wrap and Ziploc bags were the go-to kitchen conveniences, and washing and reusing a red Solo cup was simply unthinkable.