Use the drive-thru or curbside pickup
The easiest way to avoid the general public in a restaurant is, well, to not go into the restaurant. Many restaurants offer curbside pickup, but any place with a drive-thru can be an ideal way to prevent unnecessary interaction.
Purchase gift cards
Many restaurants offer gift-card purchasing online, but some smaller establishments do not. Call your favorite restaurant to see if they have gift cards in-store; if they do, they should be more than willing to take an order for one over the phone and either mail it directly to you or have it ready and waiting for pickup now or at a future date.
“If you really want to support us, then buy lots and lots of gift cards that can be redeemed when we are all COVID-19 free!” Uno Immanivong, chef/owner of Red Stix Asian Street Food posted to Facebook on March 15. “I am so grateful for the opportunity to do what I love... and this is just one road bump of many life will throw out. All we can do is look fear in the eye and say you don’t scare me and then elbow (or toe) bump it.”
Buy official merch online
If a restaurant or bar has a following, odds are it's got official merchandise available for sale. T-shirts, hats, glassware, and posters are all likely candidates, and in lieu of actually purchasing food at your favorite restaurant, you can show your support by shelling out for a piece of merch. Even if your favorite restaurant doesn't have a web store where you can buy online, they might have merchandise for sale in-person; give them a call and let them know you want to pitch in!