Maybe check at ford dealer to see if a bottle is available for the headlight washers, if they never did one then it must go to normal washer bottle.
If the pipes etc going to a different direction I would say it most likely had it's own bottle, is there no sign of extra holes around there where the wires go to ?
I would imagine they are through a relay so they only operate when the headlights are on and the washer for the screen is used ?
tabetha