das Wasser
water
The transparent, odorless, and tasteless liquid (H₂O) that is necessary for life and is used for drinking, washing, etc.
Könnte ich bitte ein Glas Wasser ohne Kohlensäure haben?
Could I please have a glass of still water?

water
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water
The transparent, odorless, and tasteless liquid (H₂O) that is necessary for life and is used for drinking, washing, etc.
Könnte ich bitte ein Glas Wasser ohne Kohlensäure haben?
Could I please have a glass of still water?

'Wasser-' is a common component of compound nouns. These often describe the type of water or things that have to do with water.
Zum Kochen nehme ich immer Leitungswasser.
I always use tap water for cooking.
As a rule, 'Wasser' is used as an uncountable noun without a plural. You say 'viel Wasser' (a lot of water) or 'wenig Wasser' (little water), not 'vielen Wassern'.
Nach dem Sport sollte man viel Wasser trinken.
After exercising, you should drink a lot of water.
The meaning changes depending on the preposition: 'am Wasser' (by the water/on the shore), 'im Wasser' (in the water/swimming), and 'ins Wasser' (into the water, going or falling in).
Wir wohnen in einem Haus direkt am Wasser.
We live in a house right by the water.
The idiom 'ins Wasser fallen' means that a plan fails or falls through. The thing that does not take place is the subject of the sentence.
Wegen des Gewitters muss das Gartenfest leider ins Wasser fallen.
Because of the thunderstorm, the garden party unfortunately has to fall through.
When 'Wasser' is mentioned in connection with the body or emotions, it often means bodily fluids such as sweat or tears. Typical phrases include 'jemandem in die Augen steigen' (to come into someone's eyes) or 'von der Stirn laufen' (to run down from the forehead).
Vor lauter Rührung stand ihr das Wasser in den Augen.
She had tears in her eyes from sheer emotion.
country / countryside / land
'das Land' and 'das Wasser' form a clear contrast here. 'Land' means the solid ground that you can stand or build on. In this context, 'Wasser' means a body of water such as a lake, river, or the sea. This contrast is especially important for travel, maps, boats, or at the coast. For example, you can say that a boat comes from the water onto land.

Neben dem Campingplatz beginnt das Wasser direkt hinter den Bäumen.
Next to the campsite, the water begins right behind the trees.
Nach der Fahrt über den See stiegen wir müde an Land.
After the trip across the lake, we stepped tiredly onto land.