This is a washer fluid tank cap for Honda Civic IX / 9th Gen, but maybe it will be OK for the other models.

Replacement for 76802-SV4-003

The Tight version version snaps pretty tight.
The Normal version is with 0.2mm wider diameter. I have not testet it, but I think that it will be enough.

Tested on those Brand and Models:
Honda Civic 9th 1015
Honda Fit Sport 2011
Honda CRV 2004
Honda Pilot 2010 (109% TPU)
Subaru Forester 2011
 

The Tight version version snaps pretty tight.
The Normal version is with 0.2mm wider diameter. I have not testet it, but I think that it will be enough.

EDIT (04.03.2021): Added Honda_cap_Loose_v2_Symbol.stl and Honda_cap_Tight_v2_Symbol.stl
The Tight fit STL is reduced with 0.6mm.

Tip: If the cap is too tight you can dril a small hole to avoid the formation of negative pressure.

EDIT (17.05.2023) : Added Honda_cap_Loose_v3_Symbol.stl with recess to avoid the formation of negative pressure.

The Fusion 360 files are also here.