Drain all the water out that you can. Then use a wet vac to get out all the rest- be sure to suck out all the water that might still be in the plumbing. This is especially true if the spa will be subject to freezing temperatures. I'd also remove the filters and clean them and keep inside till you power back up.
Read your owners manual if you have one, and see if they have any specific requirements unique to your spa.
Keep it covered, move it carefully, and all should be okay.