Just use a towel or water, or whatever. This American obsession with toilet paper is very strange. I lived in Africa for two years and guess what they do there? They dip their hands in some water and wipe their butt with their hands. I wouldn't necessarily recommend this, but like, people need to get a grip and realize how many "essentials" aren't really essential at all.

You could use a portable bidet or a peri bottle. I'm very sure you could DIY a peri bottle out of some household items, to be honest, and it shouldn't be hard or expensive.

"plumbing"? "installation"?

It's connecting two screw fittings, and then installing toilet seat (two bolts + nuts). If it's a particularly fancy model you may have to plug it in.

This is about as complicated as replacing a furnace air filter, and takes about as long. If you get someone to do it for you, you're paying for them to drive to your house, not the actual time installing it (which is trivial).

Until you posted this, I thought they required a hot water supply line, and power for other features.

A cold water only bidet would save on bathroom tissue and coffee...

If it needs hot water you can always split off of the sink that is undoubtedly next to it.

But most bidets that do warm water do not use a hot supply, because it takes too long to heat up. Most use a tank or tankless in the seat, and just need a normal 120v plug.

I imagine he's referring to the type you can buy on Amazon and attach to your toilet seat.