noun
mineral water, sparkling water
A2
Mineralwasser (das) means mineral water, often used for both still and sparkling water; 'sprudelndes Mineralwasser' or 'Mineralwasser mit/ohne Kohlensäure' indicates sparkling or still. It is a neuter noun with an invariable plural: Mineralwasser. Declension follows regular neuter patterns. Common on restaurant menus and at supermarkets.
Examples
Ich hätte gern ein Mineralwasser, bitte.
I'd like a mineral water, please.
Zum Essen trinke ich meistens Mineralwasser.
I usually drink sparkling water with my meal.
Ich trinke gerne Mineralwasser.
I like to drink mineral water.
Details
Mnemonics
Picture a glass bottle labeled 'Mineralwasser' with bubbles rising (sparkling).
Sounds like 'mineral water' in English — identical idea.
das Mineralwasser — think 'das Wasser' (water is neuter) to remember neuter gender.
Notes
Often uncountable; in restaurants may be offered 'still' or 'mit Kohlensäure' (sparkling).