One 18mg, 10ml shot to a 50ml of bottle of juice will make a 3mg.
Two 18mg, 10ml shot's to a 100ml bottle of Juice will make a 3mg.
Four 18mg, 10ml shot's to a 200ml bottle of juice will make a 3mg.
Ten 18mg, 10ml shot's to a 500ml bottle of juice will make a 3mg.