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