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The clear, transparent liquid essential for life, composed of hydrogen and oxygen (H₂O).
Ich trinke ein Glas Wasser.
I drink a glass of water.
Das Wasser im See ist sehr kalt.
The water in the lake is very cold.
In German, 'Wasser' is always capitalized as it is a noun.
Remember that all German nouns, including 'Wasser', are capitalized.
In German, 'Wasser' can be used with 'das' (neuter) or without an article when referring to the concept of water.
From Old High German 'wazzar', derived from Proto-Germanic 'watōr', ultimately from Proto-Indo-European 'wódr̥' (water).
'Wasser' is a mass noun in German and does not require an article in some contexts (e.g., 'Ich trinke Wasser.').