Proportions for improvised cran-apple juice I'm making a beverage that calls for cran-apple juice (the marketed name by Ocean's Spray's cranberry+apple juice blend). My local grocers have a very limited product offering which rules out buying the blend off-the-shelf. 

I do, however, have access to generic cranberry juice and apple juice. So, what I'm stuck at is basically the proportion of how to mix them. I suppose there is some "secret sauce" element to the recipe, so understandably there was nothing on the Ocean Spray website that was of any use for mixing my own. I tried some other search engine queries, but could only find making recipes where its made from actual cranberries (not juice). Such recipes made it difficult to distinguish the proportion from the volumes of water and juiced cranberries. 

Question

Can anyone weigh in on what is a reasonable approximation of the cran-apple blend using only cranberry juice and apple juice? If other ingredients are needed, feel free to include them in your recipe and I'll try to incorporate them (as long as they are also readily available).

Note: Bit of a race against the clock, otherwise I'd happily order a bottle online or trial and error until I'm satisfied.
Searching for "substitute fresh cranberry for cranberry juice" (because that's the actual substitution you need to make) gives you this nifty recipe for cranberry juice. 

Proportion is 1:2 w/v ratio on fresh or frozen berries as juice equivalent (100g berries = 200mL juice). 

CHECK THE LABEL of your juice to verify the ingredients just to be safe - if you have pure cranberry juice, I'd stick with 1:1 w/v ratio and then add more if necessary.