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The builder's path

Five steps from a problem to its solution.

For: Households in Mexico City's rationed neighbourhoods can't tell when the water will actually come on.

“The true creator is necessity, which is the mother of our invention.”
Plato · Republic II, 369c (tr. B. Jowett)

Routes to a solution

Six ways to take this forward

Each route is a different kind of journey, with real people and organisations to contact at each step, starting with those in Mexico City.

  1. Step 1

    Join an incubator or startup mission

    They connect you to schemes and officials.

  2. Step 2

    Win a seed grant

    Prove the idea works with a small, funded prototype.

  3. Step 3

    Pilot with a public body

    A district, city or department tries it with real people.

    • Code for All ↗

      Network of civic tech groups in many countries; find the one near the problem.

What this problem needs

Ideas, sources and tools for this problem, from first interviews to funding.

  • Alerts
  • Mobile
  • Maps
  • Open data

Ideas to explore

  • Idea 1Water arrived buttonA WhatsApp bot where one tap logs 'water on' or 'water off' for a street; when three neighbours confirm, everyone signed up for that colonia gets an alert.
  • Idea 2Schedule versus reality chartPlot reported arrival times against the official tandeo schedule for each colonia and share a monthly summary with the borough.

Specific to this problem

Talk to first

  • Sistema de Aguas de la Ciudad de México (Sacmex)

    Runs the tandeo schedules and pipa deliveries.

Starter prompt

Built from this problem's brief. Paste it into Claude or any AI assistant.

Help me design and build a first working prototype for this problem in Mexico City, Mexico.

Problem: Households in Mexico City's rationed neighbourhoods can't tell when the water will actually come on.
Who it hurts: Families in colonias on tandeo, where water arrives only on certain days and hours.
The moment it hurts: Planning laundry, cooking and filling tanks around a schedule that may not be kept.
What people do today: Residents watch the tap, ask neighbours, pay for private water trucks (pipas) and sometimes block roads to get a response.
Why it is still unsolved: The published schedule and what reaches each street can differ, and there is no shared record of when water really arrived.
What solved looks like: Residents of each colonia get a WhatsApp alert when neighbours report water arriving, and a public chart compares the official schedule with reported arrival times, street by street, for the water authority to act on.
Where: Mexico City, Mexico

First, list what you would need to learn from the people affected before building, as interview questions.
Then propose the simplest version that would help, the screens or messages it needs, and the data it would use.
Keep it cheap to run, accessible, and respectful of people's privacy. Flag anything you are unsure about instead of guessing.
  1. Understand it

    Talk to the people who live it before you build.

    “Some things are under our control, while others are not under our control.”
    Epictetus · Enchiridion 1 (tr. W. A. Oldfather)
  2. Prototype with AI

    Get a working version in front of people fast.

    Using AI is not cheating. Every tool carries the work of the people who made it, and using it well is how knowledge has always moved forward. The thinking, the care for the people who live the problem, and the judgement are still yours.

    “The Analytical Engine weaves algebraical patterns just as the Jacquard-loom weaves flowers and leaves.”
    Ada Lovelace · Notes on Menabrea's Sketch of the Analytical Engine, Note A (1843)
  3. Find the data

    Open data that fits this problem.

    “The first principle is that you must not fool yourself, and you are the easiest person to fool.”
    Richard Feynman · Cargo Cult Science, Caltech commencement address (1974)
  4. Build it

    Tools matched to what this problem needs.

    “That which is an obstacle on the road helps us on this road.”
    Marcus Aurelius · Meditations 5.20 (tr. G. Long)
  5. Launch and get support

    Ship it responsibly, and find help and funding.

    “As to diseases, make a habit of two things: to help, or at least to do no harm.”

    ἀσκέειν περὶ τὰ νουσήματα δύο, ὠφελέειν ἢ μὴ βλάπτειν

    Hippocrates · Epidemics I (tr. W. H. S. Jones)

Kit written for this problem from its brief; every link was checked. Links go to each provider's own site. Zetema is not paid for any listing.