Strictly speaking, yes.

The simple rule is to use spring or mineral water from where the tea comes from. Realistically speaking, tap water is ok. Distilled water is not recommended.

Some argues bottled spring/mineral is “dead” water and will not make a good cup of tea because it is not running and live like tap water.

Temperature-wise, we suggest you to use water that has just come to boil. The finer the leaves, the cooler the water should be used. For herbal, fruit infusions and black tea we suggest the use of “jumpy” boiling water to bring out their flavours.

Green Tea and oolong tea requires water that is not as hot. White tea needs water even less hot.