[kevb]

Harmless Harvest explains it on the bottle and their website. They suggest that it shouldn't be pink when harvested, but if it turns pink later that's natural and okay. http://harmlessharvest.com/results/coconut-water#pink

In freshly cracked coconuts, pink water can be a symptom of spoilage. This is not the case with Harmless Harvest which is completely clear when bottled.

All of our coconut water is clear when bottled. However, some bottles turn pink with time due to varying levels of antioxidants, or phenols, interacting with light. We could use additives to hide the color change, but the pink bottles are just as delicious and safe to drink as the others. Variation is a part of nature. It’s ok to be pink.