にはほとんど水が

there is almost no water in

→ に
phrase Rare #36,120
there is almost no water in This phrase usually appears with ない, なかった, or ありません to express that a place contains almost no water. には marks the location as the topic, and ほとんど means “almost.”
JA: このタンクにはほとんど水が残っていない。
EN: There is almost no water left in this tank.

そのにはほとんど水がない

There is hardly any water in that pond.

その災害の後にはほとんど水が残っていなかった

After the disaster, there was almost no water left on the island.

コップにはほとんど水がありません

There is hardly any water in the glass.

井戸にはほとんど水がなかった

There was hardly any water in the well.

このにはほとんど水がない

There’s hardly any water in this bottle.