A total of 3 reviews of this product on Reddit.
Pure Enrichment MistAire Travel – Ultrasonic Cool Mist Water Bottle Humidifier with Auto Shut-Off, Mood Light, Fold-Out Leg, and Storage Bag for Portable Use at Home, Office, Hotel, and More https://www.amazon.com/dp/B07HCTYFLV/ref=cm_sw_r_cp_api_glt_fabc_NVCPTYHS6MQ96S58N9MY
Very small footprint, uses a normal pop/water bottle as the reservoir. I put a 1L water bottle on it. The little output “nozzle” wouldn’t stay up for me (kept falling down) so I stuck a piece of adhesive-back velcro onto it under the outlet hole, which stops it from falling down
I looked at buying an ultrasonic mist-maker element and building the humidifier myself, but this costs basically the same but without the time to build and debug a DIY version
Thanks! I was able to find it on amazon. I think they sell it at Target as well. https://www.amazon.com/Pure-Enrichment-MistAire-Travel-Ultrasonic/dp/B07HCTYFLV