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diff --git a/modules/by-name/wa/water-reminder/module.nix b/modules/by-name/wa/water-reminder/module.nix
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+# nixos-config - My current NixOS configuration
+#
+# Copyright (C) 2025 Benedikt Peetz <benedikt.peetz@b-peetz.de>
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# This file is part of my nixos-config.
+#
+# You should have received a copy of the License along with this program.
+# If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  cfg = config.soispha.services.water-reminder;
+in {
+  options.soispha.services.water-reminder = {
+    enable = lib.mkEnableOption "periodic reminder for water intake";
+
+    frequency = lib.mkOption {
+      type = lib.types.str;
+      default = "*-*-* *:00/30:00"; # Every 30 minutes
+      description = ''
+        How often to remind. This value is passed to the systemd
+        timer configuration as the `OnCalendar` option. See
+        {manpage}`systemd.time(7)` for more information about the format.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    home-manager.users.soispha = {
+      systemd.user.services.water-reminder = {
+        Unit = {Description = "Water reminder";};
+        Service = {
+          CPUSchedulingPolicy = "idle";
+          IOSchedulingClass = "idle";
+          ExecStart = lib.getExe (
+            pkgs.writeShellApplication {
+              name = "water-reminder";
+
+              inheritPath = false;
+              runtimeInputs = [pkgs.libnotify];
+
+              text =
+                # bash
+                ''
+                  notify-send 'Seek fluid intake' 'Water intake required' --wait --expire-time=0 --urgency=critical
+                '';
+            }
+          );
+        };
+      };
+
+      systemd.user.timers.water-reminder = {
+        Unit = {Description = "periodic reminder for water intake";};
+        Timer = {
+          Unit = "water-reminder.service";
+          OnCalendar = cfg.frequency;
+        };
+        Install = {WantedBy = ["timers.target"];};
+      };
+    };
+  };
+}