All you need is Water to activate. Specially designed stainless bottle/container and warming pod work together to produce optimal feeding temperature in minutes anytime, anywhere. Just add water to eco-friendly, biodegradable non-toxic heat packs to create the heat just when needed. This family-friendly solution allows you to instantly warm baby bottles and more while travelling, camping, and keeping up with busy schedules. Pair with Aquaheat ice packs and have a complete food storage system. Enjoy cold and warm food and drinks anytime, anywhere!