I plan my meals, and use leftovers as much as possible (eg broccoli & cauliflower on Sat night, cauliflower & broccoli cheese last night) in other meals.

I grow my own veg as much as possible - it's also a good way to learn to cook what's in season. In season veg/fruit are so much cheaper than "out-of-season" stuff. Learn to use a range of veggies - we have silverbeet risotto a bit now ...

For meat, we only serve around 90g/person when we eat it. We have our own chooks and sell the excess eggs @ work, we make enough from this to pay for their grain, they also eat a lot of leftover veg. We use their poop in the veggie patch and make up a fertiliser "tea" from it for everything else as well.

Wash in cold water, line dry where possible (I have an airing rack out on my flat roof that I hang the washing on, it's the only place with sun!)

Oh, and use cloth nappies. It costs a bit to get set up, but once you're set up, you have no need to buy any other nappies! So nice to not have to budget that extra $20/week! Also use cloth wipes with water, kinder on bub's butt and can recycle - I've cut up old flanno sheets & PJs to make some, or bought a pack of 10 washers from spotlight for $5 - bought them when Pip was a newborn and still using them.