Purchase the reusable cups for restaurants, gas stations, coffee shops, etc. in the community.
I remember when Fazolis™ switched from single-use tableware to reusable and washable tableware. I was so impressed that they made that decision and praised them for it.
Many places in the community offer reusable cups that can be purchased and reused at their establishments. I have a few in my cabinet right now. Some even offer a discount when you bring them back to refill.
I know some amusement parks offer cups that are good for the whole season. That is definitely worth the price!
Our movie theater offered popcorn buckets that were reusable and the refills were discounted on return visits.
I believe gas stations still offer BIG cups to refill for all those workers that frequent their establishments for snacks and such throughout the week.
Although I do not drink coffee drinks, I know there are coffee shops that allow you to bring your own mugs or ones purchased from their stores.
Look for things you can reuse at places that you attend often. You can always bring your own straw at least!