Thanks for the reply. The baby bottle is a two-ounce round tube made for breast-feeding. I practiced a little by walking around at home and you can't see it under jeans and two layers of tight boxer briefs (though my wife said it makes me look like I have a big package!). I may also bring a baby thermometer and make sure it is 10-15 degrees over body temperature before I go in so it cools while it's down under.