One place to start is with TV. You don't need cable. I don't even own a TV. I get all my news from the internet on my smartphone.
Dining out. This is an obvious one. People don't realize how much they spend eating out until they just look at it. It costs my son and I about ten bucks at McDonald's, arguably one of the cheapest places to eat anywhere. Times that by 5 times a week = $50 bucks. It can go way higher. WAY higher. I know. I've spent over $1K in a week on grubb when I was making damn good money on the pipeline. I was eating at some really nice places and drinking too.
That's another one. Drinking. If you drink the occasional beer, wait until you get home and have a couple. They cost about half as much at walmart as they do at a bar. I don't imagine you do much of that, just as a wild guess, but it's something to be aware of.
Smoking/dipping. If you do either, that crap is expensive. www.killthecan.com
has a calculator that will help you figure up how much you can save by quitting. It has a running calculator that will tell you how much you have saved since you quit.
Entertainment. These yahoos on FTF entertain me plenty. I don't go to movies, clubs, shopping for fun, any of that stuff. I log on and argue with somebody.
Driving habits. This can get so in depth I don't even know where to begin. One example of what NOT to do... Don't go grocery shopping, then say "Oh, I have cold items, gotta get that home", then go home, unload the groceries, and THEN head back out for more errands and paying bills or whatever. Plan your excursions. Try to do everything on the same day if you can, errands, groceries, car maintenance, etc., and try to plan your trip accordingly, possibly to do such things immediately after leaving work or picking up the kid, BEFORE going home for a nap, dinner, play time, whatever.
Diet. This can get extreme. I don't go to extremes. But, homecooked meals are cheaper, as I've already mentioned. They are also much healthier, in general, saving you even more in the long run in regards to your health. Also, what you drink. I buy a package of tea bags that cost about $4, and a pound of sugar that costs about the same, and I have a tasty drink for over a month. Compare that to around $1.50 for a 20 oz. soda every day, IF you only need one drink a day. Drink water as much as possible. A homecooked meal at my house of fried chicken, biscuits, gravy, mashed potatoes and sweet tea costs around... maybe 50 cents to $1 total for two people. The same meal will cost around $10-$15 anywhere else.
Have a great driving record, and your car is paid for? Get a basic libility insurance plan, especially if you have health insurance and a supplemental. Even more especially if you have good credit and some money in savings to get a new car if you're hit by someone that has no insurance, which happens way too often.
Don't stop taking a shower. But DO stop watering the lawn. God (or who/whatever you may believe in) made grass, and it's survived for thousands upon thousands of years without help from any man. Reduce the frequency of your cutting if you can, to maybe every 2 weeks instead of 1, or 3 instead of 2. I think any more than that, and the added strain on your mower may outweigh the benefit. If you pay someone to cut your grass...? Do I really need to say it? Stop that.
On water - wash your dishes by hand. If you want to go that far. Water is usually cheap. My water bill runs around $14 per month, and I'm not trying. I shower daily, sometimes twice a day depending on what happens. I make my sweet tea, I do my dishes....
Electric. Look for drafts and take measures to stop them. Turn lights off when you leave a room, don't turn them on to begin with unless you need to (I have no lights on until after dark, as I benefit from great natural lighting in my home). Unplug your "vampire" appliances (no, they didn't come from a store owned by the Cullens's), the appliances that draw juice when it's not being used, such as chargers, coffeemakers, TVs, computers, such things like that. Also look for any damaged wiring, faults, or grounds.
This is just a start. This is my daily life. I do splurge if I have a little extra money. I went to Wendy's today and got a spicy chicken sammich with chili cheese fries, extra onions.