The American Drunkard recommended spritzers: cheap gallons 12% red, cheap liters of Lem/Lime diet.
Liquor is quicker than spritzer.
My local bevmo has been sold out of diet ginger ale for weeks. Plenty of new whiskeys available though. Got some bottles of Jameson IPA cask aged, and Jameson beer barrel aged. Tasty stuff. Had to settle for diet 7-up though after they ran out diet ginger. Which was also nearly sold out. I guess not enough profit on a $2 liter of diet soda for them to care about inventory.