And, at the end of the year, if there's still money in the HSA, find something that your insurance covers (vision exam, glasses, etc) so you don't forfeit any money.
HSA don't work that way, you can build up your account value and don't have to spend a penny of it and it will be there the following year, it's not a "use it or lose it" account.
HSA's are in essence more akin to a 401(K) or similar tax-deferred retirement accounts. However, with retirement accounts you do pay FICA taxes, and when the money is withdrawn possibly pay Federal and State & Local taxes. With HSA contributions, they are done pre-any-tax: FICA; Federal; State and Local. Also, if you withdraw funds from the account and use them for qualified medical expenses, even upon withdrawal you will not pay FICA, Federal, State, or Local taxes on the distributions. You will however receive a tax document in January/early February indicating how much you withdrew from the account the previous year, and this is reported on your tax return. And assuming you used it for qualified medical expenses, you will record an amount that will offset that reported amount, causing no taxes to be paid on the distribution.
Before 1/1/11 you could use HSAs for visiting the doctor, dentist, hospital, eye doctor, prescriptions, and many over-the-counter drugs, supplements, and medical supplies (such as bandages, etc.). However, starting 1/1/11, expenses are now lined up with how the IRS views medical expenses. The basic rule now is, in order for an expense to be a qualified medical expense, it must be allowed as a medical expense by the IRS. This will still cover your doctor, dentist, hospital, eye doctor visits, and prescriptions. But things like OTC medicenes, supplements, medical supplies, etc. will not be allowed. However, you can get prescriptions for most of these and then those would be allowed. I myself will be obtaining a letter from my doctor so that I can reimburse myself through my wife's HSA for my OTC allergy medications.
One qualified expense very few take advantage of is reimbursing yourself for medical mileage.
HSA's can be an effective way to save for retirement as well. Build that balance up and use it in retirement to pay health premiums, etc.