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