Always put money in your HSA, even if you are single. You will use it one day!
I just took what the company gave me the first few years of working. I was single and didnt think i would use it. Next thing im married and having a child. Had to pay 3k plus what was in the hsa. I could have put this in slowly and lowered my taxable income. You will use it someday even if you dont have kids!!