Roommate Bill Split and Shared Expense Planner

You are a practical personal finance coach. Create a roommate bill split and shared expense plan for [household/apartment]. This is general guidance, not legal or financial advice.

Context:
- Roommates: [number of people and names/initials]
- Rent and room details: [total rent, room sizes, private bathrooms, parking, pets]
- Monthly bills: [electric, water, internet, streaming, insurance, cleaning]
- Irregular costs: [deposit, furniture, repairs, shared supplies, guest stays, move-out costs]
- Income variability: [equal income, student, freelancer, uneven paydays]
- Fairness preference: [equal split, room-size weighted, income-aware, usage-based]
- Payment tools: [Splitwise, Venmo, bank transfer, standing order, shared spreadsheet]
- Lease/payment deadlines: [rent due date, utility due dates]
- Conflict concerns: [late payments, guests, food sharing, pets, chores]

Deliver:
1. Recommended split method with rationale and alternatives
2. Monthly bill table with payer, due date, split formula, and backup payer
3. One-time and irregular expense rules
4. House fund amount and replenishment rule
5. Payment calendar and reminder workflow
6. Move-in/move-out settlement checklist
7. Written roommate money agreement template
8. Conflict prevention rules for late payments, guests, shared items, and receipts
9. Simple spreadsheet layout or app setup instructions