tweaked it a little, but here's the recipe from @/ohhowcivilized on Instagram:
(We made this in two bottles for 4 people)
Ingredients:
• 4 bags of chamomile tea
• mint leaves (you can decide the amounts as long as it's not too sweet)
• 3 apples, chopped into small pieces
Recipe:
Add the chopped apples and plucked mint leaves into a 2 litre bottle (you can divide it into two bottles and add half of everything). Add 4 tea bags of chamomile tea and fill the bottle up with water. Refrigerate for 12+ hours, strain the concoction and mix it with sugar and fresh mint leaves to your taste.