Bath crayons

My younger brother has afriends that is a Brazilian math wizard. He does his best work in the shower. He writes his thoughts on the steam in the shower glass and has a water proof camera nearby to take pictures before they vanish.

Fecal smearing, if you have tile, works pretty well.

Rite in rain + pencil

Nothing special.

I have a decent quality paper notebook and a pencil attached to it sitting on a shelf nearby the shower (using a softer pencil than your usual HB/2B, say a 4B or 6B) and I can easily reach out for them whenever I need to jot something down. Not worrying at all about messing the paper with water as its sole purpose is to hold the notes for as long as it takes me to finish showering: it being decent/good quality paper, Clairefontaine in my case, it won’t instantly break apart when faced with water. I simply don’t write under the shower.

Get a smart speaker or use your phone to take voice notes

Most phones are waterproof enough these days that you can just use them with wet hands in the shower, I keep mine on the sink next to the shower and occasional use the phones mid shower when needed. You could also use a voice to text notes app if you want to be as hands free as possible

If you use an electric device like a tablet or smartphone, cover it with a ziplock bag to make waterproof and get ones of those dedicated pen for that electronic device and preferably a pen that doesn’t need batteries. It should be able to take notes this way. Or better yet, forget about the pen, since the device probably has a keyboard, just type it out instead of writing. I had luck watching videos in shower with the ziplock bag but I never tried writing notes in the shower.

Never have I related to shower thoughts. For one it’s too short to do any thinking in there. Also, I don’t really want to think in the shower. If I’m relaxing, it’s head empty in the stream of water.

Same goes for singing in the shower, it was always a TV thing.

My point is how many people actually do anything in the shower besides washing (mostly)?

Also there are those stone notepads. The paper ir smooth and water proof, can be written with a pencil or a pen (not a fountain one tho, but that’s not relevant in the shower either way). I tried it once as a daily notebook and I didn’t like it. With a mechanical pen after some writing it grips the core by the sharper angle and breaks it.

You could try remembering things. Might be good practice.

I mean, we’re not exactly talking about a dream upon waking here…and you can remember those too with practice.

Set your phone just outside the shower with a voice recording app on and recording?

There are waterproof pencil and paper sets that you can attach to the wall with suction cups. I have a set and use it pretty frequently when I have some sudden shower inspiration that I don’t want to lose.

I mean, you could set your phone outside the shower and record your shower, just speak out your idea and transcribe it after the shower.

If you have glass partitions try a grease pencil or oil based crayon on the glass(There’s another name but I’m brain-farting on it. Oil pastels, maybe. Gah, medication that effects your memory sucks.).

You could maybe fab up a thick glass pane with a plastic backer and keep it in the shower. Hanging it might be tricky. I used to love hitting up the weird leftover building supply type places or even flea markets for weird stuff to repurpose.

The white board idea works, but you’d need one, with pen, that is specifically water proof.

Maybe experiment with different pieces of plastic from your local big box or hardware store and a grease pencil.

Grease pen on the shower wall.