Decent whisky, bitters, club soda, ice in a short glass.
Gin, flavored fizzy (LaCroix etc), splash of lime juice, ice
Gin shaken with ice, small rinse of dry vermouth in glass, 3-4 blue cheese olives
4:3:3:4 añejo tequila, grand Marnier, key west lime juice, honey simple (50/50 honey and water) shaken or blended with ice. (Could sub honey for sugar free sweetener to be "healthy")
My favorite margarita is just 2oz tequila (yes añejo or reposado), 1oz orange liqueur, juice of one lime. No sweetener, the liqueur provides enough sweetness.