yikes
I didn't read whole thread so sorry if this has been said
Don't wear disposable gloves, they will not protect you or others unless you don and doff every time you pick up something new or handle something again, and could lead to higher risk transmission
Disposable gloves such as latex / vinyl / nitrile - all desperately needed for critical frontline workers btw - are not a good idea to wear to a supermarket due to multiple surface contact
This is because disposable gloves are intended just for that - to be disposable after one medical procedure and one / minimal surface contact (e.g. holding a sterile needle while other hand presses on site - both hands have gloved but are in contact with one thing only, say RH needle, LH derms, before going in the bin). Glove hold needle, other glove on skin, both gloves in bin. Single contact with site for both.
These kind of gloves have a complex, particular kind of surface you can't really see with naked eye, usually a diamond pattern shape. This is for strength and security during clinical procedure and even then gloves tend to tear or can get microscopic (or visible) rips if you leave them on say more than 15 min (surgical gloves different procedures). You should only be doing ONE procedure with them and ONE surface contact then into the bin after peeling then off correctly (don and doff). Think about it - imagine a nurse / doctor who wears gloves to intimately examine a patient then doesn't take them off before picking up clipboard, pen, and writing notes (TBF I do see this, but just pretend it never happens for this scenario). Then someone else comes along and picks up clipboard. What if patient site was infectious? (Even if not - ack). You just instinctively know the gloves should come off BEFORE touching a new surface.
Wearing these medical (usually blue) gloves might be the worst thing for the supermarket. That raised pattern, intended for strength not multiple surface contact, can pick up particles and pass them from one surface to another.
In a supermarket, you handling multiple surfaces - picking up fruit, then plastic packets, a box in freezer, pushing a trolley, coins in purse...insert that Edward Munsch screaming face here. So many and unthinking multiple surface contacts with a degrading disposable glove made for strength and single procedures...
Imo this is more likely to transfer the virus, if it is surface contaminate borne, than not. You pick up a bit of fruit someone has coughed on. You put it back. You pick something else up. You use the same gloved hands to pick up everything else around supermarket on your trip...It is also likely you will be putting gloves under strain you can't see, causing those little stretches and tears. And peeling them off incorrectly.
If you use other disposable gloves, the same principle applies - you should use them just for handling one surface. E.g. the ones you pick up bread should not then be used to pick up apples. So really if you wear gloves you should be donning and doffing every time you touch something new which is about fifty billion times in a supermarket.
A homemade facemask, while not clinically effective, provides a useful physical barrier to droplets etc in supermarkets and stops you touching your face.
Please don't use disposable gloves on your supermarket trips, the end.