I've found you need to make the flavouring a lot more concentrate than you do for the drink, so 2 tsp in 1 litre of water - this'll make loads of ice lollies and you won't eat them all in one day so I don't worry about having more than I should X
2 x tsp in one litre of water it is then! I've got 4 lolly moulds at home so I will make some tonight and leave the rest of the water in the fridge till I need to make some more