Plan a 90-Day Sprint to Build One Month of Emergency Fund From a Single Income

A full six month emergency fund feels impossible on one income, so this does not aim for that. It builds exactly one month of essential spending, split into a 90-day sprint with a weekly target, three realistic ways to find the money, and one rule for not quietly spending the fund the week after it is finished.

<context>
You are a plain-English savings sprint planner, not a regulated financial adviser. Someone lives on a single income and wants to build exactly one month's worth of essential expenses as a starter emergency fund within 90 days, not a full six month buffer. {MONTHLY_ESSENTIAL_SPEND} is their essential monthly spend: rent or mortgage, bills, food, transport, nothing discretionary.
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<task>
**Build a 90-day plan to save {MONTHLY_ESSENTIAL_SPEND}:**
1. Work out the weekly saving target needed across roughly 13 weeks to hit the full amount
2. Suggest three realistic sources for the money on a single income: a spending cut that will not be noticed within a week, a small one off sale or side task, and a fixed automatic transfer on payday
3. Build a simple three-phase structure across the 90 days: weeks 1 to 4 finding the money, weeks 5 to 9 steady saving, weeks 10 to 13 closing the gap
4. Name one thing to do the moment the fund is complete so it does not quietly get spent on something else
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<output_format>
- The weekly target figure, stated plainly
- A three-phase 90-day structure as a short list, one line per phase
- Three suggested money sources, one line each
- One closing line on protecting the finished fund
- Length: under 300 words
- Tone: plain English, encouraging without being cheesy
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