I think for right now, you can use topical nail treatments to fortify your nails. But what really helped me was almost something of an "accident". I don't do biotin, and I don't do MSM, or anything other focused dietary supplements besides eating actually foods that contain this stuff already.
But over the past couple years, my water intake and garlic consumption have really risen alot. There are conclusive studies out there about consumption of garlic and strong bones,teeth and hair, I would assume that may go for nails as well. There is even an old wives tale about putting some chopped garlic in your clear nail polish (not sure how well that one works). Oddly enough, I found that my nails began to withstand stressful conditions that they normally would have snapped or peeled under. I can tighten screws with my nails with them breaking off, and I've broken two nail clippers while trying to trim them!
Of course this didn't happen overnight, but I found over the past 18 months that I could essentially neglect them, and they'd grow like weeds, long and strong. I used to be one of those people that spent time everyday trying to baby my nails to get them to grow, only to find them broken when I did the littlest tasks, like typing.