You can easily make a small pitcher of these cocktails by tripling the ingredients and keeping the pitcher in the refrigerator. Just add ice when you are ready to serve them.
This is a tip I learned from my Dadmany years ago. If you are making individual cocktails in a glass, make sure you always add the ice first. That way the alcohol cools immediately. Then you can add the mixes. If you are making a small pitcher, make the cocktail in the pitcher, without ice, and fill each glass with ice so you don't water down the entire pitcher of cocktails.