I'm going to France on the over night ferry in 1 week and need to buy instant formula. We use cow and gate first infant milk but it's sold out of little bottles everywhere in Somerset. He's 6 months old, does anyone know if it's ok to buy a different brand just for journeys or to buy follow on? I don't want an upset baby on the journey. 5 hours in the car won't be fun if he's feeling poorly or rejecting it.