I actually did go through the manual on this. No mention of a low level warning but a number of mentions of regularly checking your windshield washer fluid levels. Based on my review of the manual, there is no warning indicator, you are on your own.
If you can't find the volume levels of the reservoir, just fill with regular stuff first time and see how much it takes. Or even water and then use it quickly in the first few days and you'll know how much to put in. Just offering a Plan B and C. Good to know it does have the indicator (seems like a basic/standard feature).
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