Boil water
Store in vaccum flask (dunno if anyone still using this in this
day and age)
Overtime, heat still get lost, pour not hot water into drinking
water kettle.
(on side note, not that I dun trust the pipes and tanks, it is
the workers that are cleaning them that I dun trust. I ever saw the
whole cleaning process, these half naked workers just jump into the
tanks and the amount of dirt they dig out of the tanks is like
eeeeewwwwww, plus the mixture of the sweat cum smoke ash (these
asses smoke when they are cleaning the tank) cum wash leg water cum
dirt still left in the tank, no matter how the NEA ppl certified
it, I just prefer boiled water after that)