Do you mean that you want him to learn to drink breastmilk from a bottle??? If so, try soaking various types of nipples in breastmilk in the fridge overnight so that they smell and taste good. Then, leave the house when your son is hungry and have your husband experiment with all of the different nipples. My son has one particular type of nipple that he likes and hates the rest. The type of bottle doesn't matter to him at all, it's only the nipple.
If you meant that you are trying to stop breastfeeding, maybe you could freeze milk for use during your trip? We're weaning, but it's a very gradual process that has taken much longer than a month.
Whatever happens, I hope it works out well for you and your family.