agree with Starbucks. We never used a thermos for water - only in bottles so security always knew it was for my baby. My baby also always drinks room temperature water. I always used the pre-measured formula containers on board. When I flew from HK to NYC, I would take one large bottle of water of the Alp Water for baby that said on the plastic "baby water" so security would have to questions about it even though my baby could drink any bottled water.
