Making diet cordials and sodas
If the recipe does not call for large amounts of juices of sweet fruits or require oleo saccharum, you can make a diet version using sugar substitutes. However, sugar substitutes have different levels of sweetness when compared to sugar, requiring you to adjust the proportion to match the original intensity.
Splenda, Equal, Lakanto, xylitol, or maltitol: Simply substitute the original amount of sugar for these sweeteners.
American Sweet'N Low or another brand of saccharin: Use 1/12th of the original amount of sugar and replace the remaining sugar with water.
Canadian Sweet'N Low or another brand of cyclamate: Use 1/6th of the original amount of sugar and replace the remaining sugar with water.
Stevia in the Raw or Truvia Baking Blend: Use half of the original amount of sugar and replace the remaining sugar with water.
Erythritol: Use 1/3 more than the original amount of sugar and deduct an equal amount of water. For example, the original 1886 Coca-Cola recipe calls for 160 mL of water and 300 mL sugar; you can substitute it with 400 mL erythritol and 60 mL water.