Buy yerba mate gourds to drink it the traditional way.

These are hollowed out, dried, and decorated gourds from which yerba mate is traditionally infused. All gourds are approximately 3-inches in diameter. Rinse and dry after every use. To sanitize the gourd as needed), fill the gourd with 150-degree water and a teaspoon of Peroxide. Let this sit for a few minutes, then empty the gourd, rinse, and let dry.