Web alarm clock for 5:00 p.m.
You are only just waking up, and the first thing waiting is to collect water after the supply comes back. An alarm set for 5:00 pm gives you a clear cue to get up, find the clean containers, and check the tap before the household rush begins. Keep the containers near the kitchen or bathroom so you do not lose time looking for them while still shaking off sleep.
Your water collection may depend on hearing the alarm even while you are checking messages or opening another app. The timer can remain active when its browser tab moves into the background, though some phones may restrict browser activity. If the page is closed or the phone goes to sleep, the water reminder may make no sound, so keep the browser open, leave the phone awake, and turn the volume up.
Once the containers are filled in the late afternoon, leave a practical buffer before your next commitment that day. At 5:00 pm, roads and public transport can become busier as people head home, while dinner preparations may also need attention. Note the next fixed task before you start, then limit the number of containers if filling, carrying, and storing them would use that buffer.