One or more additional sensors that do not measure hydration level of the user can be coupled to a hydration sensing {HEAD ~ element} to determine {TAIL ~ the amount} of fluid consumption for the user in different conditions 
to determine
One or more additional sensors that do not measure hydration level of the user can be coupled to a hydration sensing { HEAD ~ element } to determine { TAIL ~ the amount } of fluid consumption for the user in different conditions
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH