why not just save some hassle and buy 2 jugs of premixed 50:50 ethylene glycol-based antifreeze? That's all the manual recommends and they generally use distilled/deionized water in the premixes.
If you're not in a huge hurry, I think you should just get a normal trickle charger and charge the battery. A jump start is only going to last you so long since the battery doesn't charge itself while riding the way a car does so you'll have to charge it soon regardless. Plus even with the car off, you're still gonna be pushing more current into the bike battery/electrical system than it likes. It only takes 10 hours (aka: overnight) to trickle charge at the recommended 1 amp so unless you need to ride today, it might be better in the long run.
You might also want to consider a fuel system cleaner in case that 2-year-old gas has left some gunk build-up in the engine and, though I admittedly have no idea how to check for this, i've heard the tires can develop soft spots if left resting on the same spot for prolonged times.
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