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[Advice] I'd like to build a first aid kit or two to have in my bag & car - What do I put in it that will be useful in everyday situations?
I realize this isn't what you're asking for, but I thought it might still be useful. I've been carrying pre-built kits made by Adventure Medical Kits for around 30 years now. I particularly like their "Ultralight" series, but all of their kits seem to be practical and well thought out. They have specialized kits for just about every situation, but their general purpose kits do a good job of covering all the things you are really likely to need without wasting space and weight on things an average person is unlikely to need.
I carry an Ultralight .3 in my pocket or pack most of the time. I have an Ultralight .7 in my bike bag. I have one of their larger kits (I don't remember which) in both my cars. And I keep an Ultralight Pro in my kitchen, in case I need to grab one in a hurry.
I add small amounts of my daily medications to each kit, just in case. They see enough use that I end up buying new ones every few years.