Anything you can use to ‘charge’ a module, i.e. probes for your probe launcher, the charges for interdiction launchers or command bursts, scripts for your sensor boosters.
They’re indeed cap boosters. Drugs are consumed and are called ‘consumables’.
Modules are modules. The things you can put on and take off your ship’s module slots.
Rigs are not modules, they go in the rig slots rather than module slots and cannot be taken off from regular ships.
This is the only ambiguous one from the list, as cargo containers indeed are under the ‘deployable structures’ in the market browser. But how often do you go out and ‘deploy’ cargo containers in space in your gate camps? People mostly use these for inventory management, not for deployment, so that shouldn’t be hard to remember.
If people read liquid ozone and stront and think “any ice product” when it’s explicitly spelled out, that’s on them.
That’s the view mode.
But do you use sorting?
In details mode the way of sorting is a bit hidden, I see, but in ‘icons’ mode you can rightclick empty space and sort by type:
which then shows all same-type items next to each other so you can easily grab for example all the ‘deployables’:
This sorting also carries over to the list or details view. Having your inventory sorted makes it much easier to see the different item categories.