Has anyone travelled with a liquid concentrate formula? I'm trying to figure out how we would even do this. I guess a small cooler with pre-mixed bottles for the flight? They let you carry bottles on if they're over 3 oz right? And then I guess I should find a source where we are going for the trip. I could also switch to powder for the trip, but I have a theory that the powder version makes her constipated, so I'd rather not. Ideas?