Very interesting idea. There is no water tank included. This is a BYOW design. I've tried a few water bottles from home and they seem to be working fine. It charges with no issues using the included USB-C cable. I can't say how long the charge lasts as I've never used this device. This design is very compact for complete portability. Everything is in the case, except for the water bottle, of course. The water inlet pressure seems sufficient and works well. The flat design is a bit odd, but I think they made that choice in the name of portability. .
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