If you have no other choice, and it's limited to a few months, you could protect it by sealing it in an air-tight plastic bag with some desiccant packets.
If you don't have ready access to those, seal the equipment in an air-tight plastic bag with the excess air removed. Put that inside another air-tight plastic bag, and surround it with uncooked rice in the outer bag. Rice isn't nearly as hygroscopic as the silica used in the desiccant packets, so you will need a lot of it.
If the printer is an inkjet, storing it for months is a problem in any environment because ink will dry up and cake the printhead nozzles. If that applies to you, also check out other answers on Super User and online specifically about that. How to best deal with that depends a lot on factors, like whether the cartridges contain the printhead; if the printhead is seperate, whether it is easily removed (i.e., a user replaceable part), even the specific make and model of the printer. So it would be a broad topic to address within this answer.