water

Water is vital for the regulation of body temperature and to
keep body processes functioning. Intake of water, and
subsequently body temperature regulation is the partygoers
biggest concern. Many of the tragic ecstasy related deaths are
likely to have been initiated by insufficient water replacement,
rendering the individual incapable of controlling body temp. In
hot club atmospheres (where there is often inadequate air
conditioning - some clubs even put fans on hot!) the body
temperature can rise sharply leading to heat exhaustion, heart
strain, and at worst death.

please read the caution