Is the water vapor coming out of Toyota’s first production fuel-cell vehicle drinkable? If you’re driving through the Sierra Nevadas? Probably. Cruising through Beijing? Not so much.

Toyota executive Seiji Mizuno discussed whether the water vapor emitted from the Toyota Mirai is safe enough to drink and, according to Automotive News, the short answer is «yes,» since the slightly-acidic vapor has «fewer organic impurities» than milk.

The catch, though, is that the vapor immediately gets mixed with the surrounding air. That means that there’s always the chance that something funky gets mixed in with the air intake, especially if the Mirai’s driving through a smog-infested city. That makes the idea of swigging off the tailpipe a slightly riskier venture, so it’s best to keep that reusable bottle full of tap water handy.

Toyota, which recently showed the Mirai off at the Los Angeles Auto Show, confirmed earlier this month that the Mirai would start sales in California in 2015 with lease rates starting at $499 a month. While the model’s MSRP will be $57,500, federal and state incentives could bring that number to less than $45,000. Fewer than 200 Mirai vehicles will be available in the US by the end of next year.

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