I'm here for that little bidet. I carried something like it on the PCT that screwed onto a water bottle for about 400 miles but never actually used it. Now its shoved in a bag someplace thank you for reminding me about it ill have to dig it out for my next trip.
On that same note my piece of kit that is just silly for me to carry around is the simple shower.
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Its a shower head that screws onto a water bottle. Yah... I know...but here me out. That little sucker will drain a 2L water bottle in about 25 seconds. It works shockingly well. That a bar of soap and a little microfiber towel I found on the side of the road I can literally have a shower anyplace for free. So long as I can get water... and be naked for a minute. Just DONT let if freeze with water inside. Ask me how I know.
I have one of those, but I swapped it out for a Sea to Summit pocket shower. It's heavier but it replaced the dry bag I wash clothes in