Firstly sit down with your wife and “discuss” a budget and discuss what you need versus what you want. Then figure out what you can actually do without before asking anyone else for advice. Try to figure things out as a couple and then as a couple ask for ideas from the other couples in your community. Sometimes it pays to buy in bulk and split things with a neighbor or two so you all get the benefit of the savings. So for instance if one couple hosts Friday night and one couple hosts Shabbos day, you each wind up spending on just one meal and it really comes out cheaper than both of you spending on two meals.
Walking and carpooling if you can work that out with your neighbors will save on gas and/or car insurance or car payments. Using extra sweaters or heavier blankets can save on heating bills if you pay for heat. Buying on sale is always a good idea and then making up menus with items you find on sale works as well. You don’t necessarily have to be stubborn about the foods you eat, try new foods because they are on sale.
But most importantly disscuss everything with your wife and make sure you are on the same page.