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Ideally, it should be re-cemented by a permanent cement by a dentist. However, in an exceptional circumstance such as this, you can buy a temporary luting cement yourself and fit it back on.
Try "Dentemp" . It is a traditional dental combination of zinc oxide and eugenol (clove oil) mixed when needed to re-cement a cap or a bridge. It's strong enough that you'll need to have a dentist remove it later.
Have a look at these sites for more information:
However, please remember to not chew anything sticky , and to visit your dentist as soon as you are back.
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Good Luck !