Save for a big family cost and keep cash for a bad day. Use two separate pots,...

https://dibz.me/blog/how-do-i-budget-for-a-nursery-deposit-and-a-car-repair-in-the-same-month-1293

Save for a big family cost and keep cash for a bad day. Use two separate pots, one for the bill and one for emergencies. Put in a set sum each week