This is the 13785th most frequent German word.
erfrischendes
Refreshing.
In this sentence, 'erfrischendes' is used as an attributive adjective modifying 'Glas Wasser', indicating the quality of how refreshing the water is.
Ich habe ein erfrischendes Glas Wasser getrunken.
I drank a refreshing glass of water.
'Erfrischendes' is used to describe 'Getränk' (drink). It signifies that the drink provides a sense of freshness and coolness, appropriate for the warm context.
Eine erfrischendes Getränk ist bei dieser Hitze genau das Richtige.
A refreshing drink is just the right thing in this heat.
Here, 'erfrischender' (masculine form of 'erfrischendes') modifies 'Wind', describing the wind as being revitalizing and cooling.