Funnels that are specifically shaped for that purpose very much are, yes. I don't understand how that's even a question.
Adult diapers' main purpose isn't peeing while on a van trip; I would imagine elderly people around the world need them day to day. A funnel specifically made for women to pee is an incredibly niche product with little to no day-to-day use.
Nobody said that a diaper is superior to a funnel. The grandparent comment makes it seem like it's easy for half the population to pee in a bottle and I called them out on it. I didn't even mention the ubiquity of adult diapers, I compared finding a specialized funnel to a water bottle on purpose.
"The grandparent comment makes it seem like it's easy for half the population to pee in a bottle and I called them out on it."
Funnels of various sizes readily available in every hardware and auto parts store. Also these specific funnels are readily available in outdoors and sporting stores. It is easy to find funnels. No need to defend "half the population" by "calling them out on it."
I guarantee you there are many women van/car lifers who don't use adult diapers (I know quite a few!). As has been said many times in this thread, there are inexpensive tools for this.
I said that just peeing in a bottle really only works for half the population. That's all. Your choice to somehow read into those words so deeply as to make up a completely new sentence that was never written is yours alone.