Leon
The ink WILL dry up in the print head if the printer is stored for a period of time. You may notice that if you haven't printed for a while, you will have to do a head clean. This is because the microscopic holes in the head have crusty lumps of dry ink in them. Leave it for long enough, and those crusty bits will extend through the whole print head and into the delivery chamber.
At this point it is highly unlikely you will clear it with a Head clean.
The only way to safely store the printer is to remove the cartridges, place some sellotape over the exit hole (Wipe it clean first), and also over the breather hole on top of the cartridge. Then seal it in a glad(or similar) zip lock bag. Then you need a Wetting Solution (May be available from an ink reseller) Using a syringe with a thin plastic tube, place the tube over the pointy ink inlet (This is the thing that punctures the exit hole of the ink Cartridge) VERY gently push the wetting solution through the heads until it runs clear. Forgot to mention, you will need to have the heads in the middle of the printer, (Unlocked) and a sheet of plastic under the heads, with something to soak up the solution as it runs down the plastic.
You will need to repeat this with each head. I.E. if its a 4 colour printer, you will need to do it 4 times, 6 colours, 6 times, etc. Once done slide the head back to its normal park position, Cover the printer and your done.
You can now safely store it for a long time. When you fire it back up, you will have to do a couple of head cleans to prime the heads again. Don't forget to take the sellotape of the cartridges.
The other option is give the printer to a family member who can run it once a week for you (even if its just a nozzle check) to keep the heads wet. This is what I would do, because the other option can get real messy. I have to do this to my industrial printer when we close down over christmas, but I have the advantage that I can raise the heads up to 100mm above the platen, so I just put a tray under the heads and flush them out, so not as messy.
Hope you have a great time touring!