In a bowl, sprinkle the gelatine powder on 180 ml (3/4 cup) Fruité drink and let set 1 to 2 minutes.
Meanwhile, in a pan, bring to a boil remaining Fruité drink, sugar and lemon juice, then cook while stirring gently until sugar dissolves completely. Add gelatine mix, then bring back to a boil over medium heat. Cook for 2 to 3 minutes more, stirring well.
Let cool for a few minutes before pouring into moulds.
Chill at least 2 hours, then unmould carefully. Enjoy right away!