88 All-Time Best Dinner Recipes

My wife and I were lamenting how rare it is to find a good potato mac salad in the southbay area anymore. She remembered a recipe her grandma used to make and this came up in my search. It's pretty much spot on - thanks!

In the USA 7up & Schweppes are carbonated beverages and Lemonade is a beverage made from lemon juice, water and sugar. So I am confused as to what to add to make this recipe.