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 the amount of fluid consumption for the user in {TAIL ~ different conditions} 
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 the amount of fluid consumption for the user in { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL