You actually don't have to!

The "Get water from the Old Well" task is repeatable, which means that you can complete it as many times as you need to in order to get the required items for your tasks. Once you complete this task, you will exchange 25 Energy for a Water Bucket. You will continue to see the red dot on the "Show" button as pictured below, namely because you have the option to complete this task again whenever you need to, so this is intended.

If you complete it multiple times, each time you give 25 Energy for each Water Bucket producer.