> Just use a water bottle like the rest of us!
That's not just using a water bottle. And certainly is specialized enough of a tool that you likely can't find it as ubiquitously as a water bottle.
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.
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."
