Identify your use: smoothie (drinkable) vs. bowl (spoonable). Choose the substitute based on whether you want pure berry flavor or a more juice-like base.
Measure using the 1:1 ratio (by weight if you have a kitchen scale). If your substitute is concentrate (like grape), thin with water first.
Blend 30–60 seconds, then rest 1 minute and blend again if needed for a smooth, scoopable texture.
Adjust flavor: add a pinch of salt to deepen berry notes, and only add extra sweetener if your substitute isn’t already concentrated.
Use immediately for best texture; if it’s too thin, add more frozen fruit or ice and blend again.