Buy gift cards (many businesses have gift cards available on their websites) and class-passes (for yoga studios/gyms) to help small-business owners to continue to pay their employees and contractors while shut down temporarily.
Purchase your bulk orders now (from a food co-op, for example). See if the business offers curbside pickup or delivery.
Purchase merchandise from your favorite retailers, breweries, restaurants, etc like shirts, hats, books, signs, etc. from their websites and have shipped to you.
Support your local theaters and concert venues by purchasing gift certificates on their website that you can use at a future show.