Learn Icelandic: Flaskan er líka tóm og ég hef ekkert vatn. - The bottle is also empty and I have no water.

Ekkert is the neuter singular form of the word enginn (no/none). It changes to match the noun it describes. Because vatn (water) is a neuter noun in the accusative case here, we must use the neuter accusative form, which is ekkert.

I thought ekkert meant 'nothing'. Can it also mean 'no'?

Yes! When used on its own, ekkert usually means 'nothing'. But when placed directly before a neuter noun like vatn, it means 'no' or 'not any'. So ekkert vatn translates to 'no water'.

Why is the word for empty written as tóm instead of tómur?

Adjectives must match the gender of the noun they describe. The base dictionary form is the masculine tómur, but flaska (bottle) is a feminine noun. Therefore, the adjective takes the feminine singular form tóm.

Why does líka (also) come right after the verb er?

Icelandic strongly follows the V2 rule, meaning the main verb is almost always the second piece of information in a sentence. Short adverbs like líka usually tuck in right after that verb.