Working out what your necessary spends are is a good way to understand how much you really need to spend each day, week or month. There are some things you won't be able to avoid – mortgage/rent, groceries, phone bills, plus public transport and petrol costs. Everything else, however, could be an optional spend you may be able to avoid.
Plan your meals and write a list of the foods you’ll need for the week, so you don't buy unnecessary groceries. It could also be worth trying to renegotiate your bills or consider switching providers.
To work out what’s an essential cost, write a list of all your expenses and mark the ones you can't give up. Minor adjustments might not look like much for that week but eventually, after months of saving, it can help grow your bank balance that little bit more.