If you have to go long distances, in modern countries, you take a train. Groceries are at a walkable distance, you can go 2 or 3 times a week easily, on the way back from work for example. Also tape water is drinkable there so you don't need to carry heavy luxury plastic wrapped water.

only if you are in bad fitness and adjusted to sitting around and driving all the time

Found the American :)

I've seen come crazy people on bikes man, surely that can be used

I have been on roads like that in Asia in urban areas. Basically mopeds are the answer to every "well what if I have to move a lot of stuff or get somewhere fast" question. It isn't a perfect solution but it is a decent one.

No one here is against disabled people using small motorized vehicles to go around. You don't need to carry stuff that doesn't fit in a backpack 99% of the time. I don't see how the car solves the bathroom issue, we have public toilets and commerces with toilets here.
Car culture pushes people far from their work with no alternative, that's what we fight precisely.