Hi Shinelife,
This is Amee from Gojiberry - Shopify Survey & Feedback App.
Both Google ads and Instagram / Facebook ads have regional targeting you can set to only target the Washington DC area.
Another trick is to input as many SEO keywords that include Moonshine & Washington DC in your site and product description.
If you have an offline presence in the area, I would suggest putting product inserts into your product that highlight your online store. So if people want to buy more they simply need to order online.
Lastly, if you want to fine-tune your marketing, create a post-purchase survey on your Shopify store asking which area of DC your customers are coming from, and focus more marketing efforts on that.
Hope this helps!
Amee | Gojiberry Team