If you don't have any of the above just put the
ice in a resealable plastic bag then put that in another larger resealable plastic bag and give it a few good whacks with a rolling pin until the ice is in tiny pieces.
Alternatively you may also place the
chips in a resealable plastic bag and crush them with a rolling pin or some other heavy object — wine bottles, meat mallets and frying pans also work well.
A section on advice for travelers advises using hard - cased luggage instead of soft, packing
clothes in resealable plastic bags, and packing a small, bright flashlight to inspect your room when you arrive.