Fruitopia Orange Goove syrup "2L jug" is the classic McDonald's orange drink.
2L jug makes 34+ cans. 5:1 ratio. The colder your water the less syrup you'll use. Start with aprx 125ml or 3-4 pumps for a 1L bottle and adjust +/- from there. Experiment with the number of pumps to find the amount that suits your taste.