A hygiene helper?

It might not be the most practical option for everyone, but I stumbled upon this on Tumblr. Hygienna Seems like a portable bidet. Has a nozzle and all that…

The concept appeals to me, though I worry the unit might "pop-out" when you squeeze the water bottle. They've probably tested it thoroughly, but I'd prefer if it screwed in at the cap location rather than relying on tight pressure to stay put. It would be annoying to retrieve that thing from the toilet bowl, particularly a public one where this is likely to see more use.