We will die without water. The human body can survive no more than a few days without water, depending on the temperature, the exposure to direct sunshine, and many other variables. It makes sense, then, that there is a blessing for a drink of water.
בָּרוּךְ אַתָּה יְ‑יָ אֱ‑לֹהֵינוּ מֶלֶךְ הָעוֹלָם שֶׁהַכֹּל נִהְיָה בִּדְבָרוֹ:
Baruch Atah Adonai, Eloheinu Melech haOlam, she-ha-kol ni-hi-yah bid-var-o.
Blessed are You, Eternal our God, Ruler of Time-and-Space, by Whose word all things came to be.
This blessing is also used for other things we eat that do not come from the ground: meat, eggs, fish, chicken, and other drinks (except wine, which has its own blessing.)
Before a full meal that includes bread, we say only the blessing over bread and that covers everything on the table.