1. Use real fruit to make juice.

Whenever possible, but this is mostly about citrus. All bottled fruit juice is inferior to fresh juiced fruit, but that especially goes for lemon, limes, and oranges, which are essential in so many mocktails. Get yourself a citrus reamer ($6), or even better if you make a lot of drinks an electric juicer ($30). (Different from the kind of electric juicer you can put a whole piece of kale in. Those will put you back $200-$400.)