Tender coconut water 
Tender coconut water: the clear liquid inside green coconuts aged about 5 to 7 months.
Characteristics
- It is about 95% water, plus sugars and mineral salts (mainly potassium).
- Laboratories use it as a supplement in plant tissue-culture media.
- An ingredient in traditional preparations from South and Southeast Asia.
Role in the preparation: It is added as is to the mix to supply sugars and minerals to the fermentation.
Caution: It ferments quickly once opened: use it the same day or refrigerate; prefer plain coconut water with no added sugar.
Sources: Coconut water - Wikipedia
Documentary information: this is neither a recommendation for use nor a plant-protection or veterinary claim. Check your country's regulations before any use.