When it comes to building savings, every little bit helps.

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As a general rule, it's a good idea to have enough money in the bank to cover three to six months of essential living expenses. That way you'll have cash reserves to tap the next time a financial emergency strikes. If your savings are nowhere close to that target, then you need to get your bank account into better shape.

You'll often hear that to save money, you need to make major sacrifices. But that's not necessarily true. If you've struggled to save in the past, your best bet may be to work on building cash reserves slowly but surely over time. In fact, socking away an extra $100 a month will go a long way toward helping you meet your savings goals. Here are a few easy ways to do that.

1. Dine out less often

A typical restaurant charges a 300% markup on the items it serves, so that $40 takeout order should only cost about $10 to prepare at home. If you're in the habit of dining out frequently, cutting back ever so slightly could free up some serious cash to save. So if you currently eat out three nights a week, try scaling back to twice a week and seeing what that does for your bank account.

2. Cut back on rideshares

If you're a city dweller, rideshares can be a convenient solution to your transportation needs, but $10 here and $15 there really adds up. If you tend to take a lot of rideshares, make a deal with yourself that you'll walk or take public transportation every other time you'd normally summon a private car. Chances are you'll be $100 richer by month's end.

3. Get a side gig

The beauty of getting a second job is that the money you earn from it won't be earmarked for existing expenses such as rent or food. As such, you should have no problem sticking all of it into savings. These days, you can turn a host of hobbies into a side gig, whether it's contributing to blogs, baking, crafting, taking photos, or caring for animals. Putting in a few hours on evenings or weekends could help you close out each month with an extra $100 in your pocket, all while spending that time doing something you actually enjoy.

4. Be smart about prescriptions

Many of us take medication on an ongoing basis, and if you manage your prescriptions strategically, you may find that they cost you a lot less. If there's a certain drug you take daily, see if you can order it in bulk. You'll often find that a three-month supply costs the same amount as a one-month refill, if not less. Also use generic medications whenever possible, as doing so could seriously slash your copays. Finally, don't be shy about requesting free samples. Doctors' offices get them all the time, and if it's a costly drug, a month's worth could easily save you from having to spend $100.