The water used to make up {HEAD ~ the alkaline solution} can either be supplied from {TAIL ~ an external source} or in part or in total from water produced with the oil 
The water used to make up { HEAD ~ the alkaline solution } can either be supplied from { TAIL ~ an external source } or in part or in total from water produced with the oil
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH