A must-have for any immersion addict, weighted bottle caps.
Gives caps a weight of 0.01 so 1000 of them weigh 10 lbs.
(Alternatively, they can weigh 0.005 to be more realistic)

Caps can be dropped: no need for a chemistry station, just go into the Furniture menu and Misc section in any settlement's workshop. Stashes of 100 or 1000 bottle caps can be placed anywhere you want, then scrapped for their value later.

Once scrapped, remember to take the caps back out of the workshop inventory to be able to spend them! If you want to access caps you left in another settlement's inventory, establish a supply line and craft some stashes in your current location.