Here are a few ideas to get you started:
1. List it Out
For most of us, making lists is not a favourite thing to do. But they work like a charm. Maintain a notepad, you even get special expense tracking notebooks, and make an inventory of all the things that are on their way to getting over. Take this list with you when you're out shopping next, and stick to it as much as possible. And if you're a perfectionist, keep lists that are divided into perishables and non-perishables.
2. How Much is Too Much?
Keep an eye on how much you're buying. For instance, do you really need six bars of the same soap just because it is on discount? What if you don't want to use the soap after three bars are over? You'll probably go buy something else, and ignore the remaining three. The same goes with food. Fruits and vegetables should be replenished on a weekly basis, and dry products every fortnight, or even a month. You don't want fungus growing on your food now, do you?
3. Follow Storage Rules
Every product comes with an ideal storage instruction. Some need to be stored in dry places, dark containers, and so on. Follow those instructions to make sure your ingredients last till you're done with them. For instance, bread can't stay out for too long so unless you're a large family of bread addicts, buy smaller loaves. And if you still have some left, you can refrigerate it for a day or two, and warm it in a toaster.
4. Pick Tasting Samples
If you like experimenting with food products, such as yours truly, try to buy the smallest size of anything first. It lets you figure out whether you like it at all or not, and whether to make it a part of your daily diet. Unprocessed cheese is one such example. You might like the sound of an exotic varietal, but it may not last beyond two to three days. So buy the smallest quantity possible. This will prevent you from spending too much on one thing.
5. Strike a Good Deal
Clubbed offers are a great way to save money when you're buying groceries. Keep an eye out on deals such as two for the price of one on spices, cereals, flours, and other household goods that you are familiar with. You're unlikely to change your mind in a month.
6. Trust Technology
Interesting apps such as Walnut (Android), Spending Expense Tracker (iOS) and Spending Tracker (for iOS) are a great boon to those who aren't quite organised when it comes to managing household expenses, or any such expenses for the matter. While some might require you to key in your daily expenses, and then calculate how much you've spent where to give you an overall result, some automatically read your SMS-es as you swipe your card etc, to track your expenses. Get one of those apps on your phone if you don't believe in blackboard lists or notebooks. Then there are numerous online grocery stores to help you too.
7. Plan your Meals
If you can plan your meals every week, you can buy exactly what you need, and not splurge on food products that you won't end up eating after all. Make that plan, and your grocery list is right there. Buy what you need, and maybe spare a little amount of a few indulgences.