Potties were a big part of my young life and have been a recurring theme in different ways. I guess we all were used to using them as very young children and I won't describe my experiences here. Later my parents always made sure there was one in my room. This was made of anodised aluminium and very cold to the bum when you sat on it. There was also one strategically placed outside the bathroom door in case I was caught short when someone else was in there. This was usually my old baby potty made of plastic.
I can recall mum noticing a wet spot on my pants and pulling my shorts down while she held the pot in front of me to catch the wee. Later if I had an accident I was often hold just to leave my wet underwear in the potty to be dealt with later.
Because the bathroom was accessed through another bedroom my parents had a big china pot in their room. I have seen mum sit on this and dad stand holding it in front of him to take a leak.
I know for a fact the whole family did the "other thing" in the potty when they needed to go urgently. There was never any toilet paper and Dad explained that as it was only to be pooed in as an emergency I should just go and pull my underwear up. There was never any problem about having clean briefs in the morning.
Once when staying with relatives my mum asked an aunt to provide me with a potty. I had to get clean pants in the night and left the dirty ones in the potty as usual. Early in the morning dad came into my room. I pretended to be asleep and watched him use the potty. i turned over and he said "I didn't want to disturb you but I was dying to go and mum would kill me if I filled my pants."
I can't remember how old I was when mum would have a potty in a plastic bag when we went out by bus. I can recall being made to use it and mum emptying it in the bushes at the side of the road at the next stop.
When our kids were young we had a house where the bathroom was separate to the toilet. We kept a potty in the bathroom for emergency use. We only realised how often it was used when we decided the kids were old enough to manage without it and my wife said it had been "very useful as she couldn't pee in the sink like she knew I did".