Add support for downstream water meters in energy dashboard

[MindFreeze]

Proposed change

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logos and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Add support for downstream water meters in energy dashboard core#155927
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

[home-assistant]

It seems that this PR is targeted against an incorrect branch since it has a parent PR on one of our codebases. Documentation that needs to be updated for an upcoming release should target the next branch. Please change the target branch of this PR to next and rebase if needed.

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[Copilot]

Pull Request Overview

This PR extends the Home Assistant documentation to cover individual water device tracking, mirroring the existing individual energy device tracking functionality. The changes explain how users can monitor water consumption from specific appliances and prevent double-counting through device hierarchies.

• Adds a new section on individual water devices to the water usage documentation
• Expands the individual devices documentation to include water monitoring hardware and capabilities
• Updates the upstream devices hierarchy section to clarify it works for both energy and water tracking

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
source/_docs/energy/water.markdown	Adds new "Individual water devices" section explaining device-level water tracking and hierarchies
source/_docs/energy/individual-devices.markdown	Adds hardware section for water monitoring and updates existing sections to include water alongside energy tracking

[Copilot]

@MindFreeze I've opened a new pull request, #41644, to work on those changes. Once the pull request is ready, I'll request review from you.