There are also what some sellers advertise as portable bidets, which are basically squeeze bottles with a long-ish neck. There are also some which you can just stick into common plastic beverage bottles.
I've been using one called
HappyPo XL (was ~£19 when I bought mine) for a few years now, started when toilet paper became scarce due to panic buying during lockdown.
I have one of the "necks" that can be inserted into common beverage bottles as well, and I use them when travelling.
They save on toilet paper and can preserve your dignity and comfort when travelling and facilities aren't up to snuff.