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Welcome..
Firstly better to state it's a RAPIDO 770F
Fiat ducato is just the cab side and used by so many manufacturers.
Just found a pic of one online and if you mean the Fresh water fill point then it is on the nearside between the two windows. Will have a key slot and needs to be opened.. Hold the filler, turn key left and remove. Then twist the cap to the left..
Or if you really do mean the fresh water TAP.. it should be in the sink..
Or do you mean the Fresh water drain tap ??? If so, sorry cant help on that one but look in the cupboards at floor level.