If it helps ladies, I had this problem with Devon, and so when I went to Takethat in concert in Cardiff, I like in berks so a good way away, and we camped overnight and came back late the next night, so two full days away! We used a TT first beaker (devon was 5 mths), and we had been using it with water since 4 mths to practice. OH gave him breastmilk from freezer in beaker , and they were fine, becaue I was not there , if I was he wanted boobs. We never did it again, as it didn't work for short trips like shopping, but fine for long ones!!