Whatever you purchase, check the expiration dates. I have seen flare kits at Walmart that expire in just a couple of months from the purchase date. Most kits should expire about three years from date of purchase. You may need a complete safety kit that includes flares, whistle, distress flag, etc. Don't forget throwable flotation device as well as life jackets for all people onboard and fire extinguisher(s). The ODNR free boating manual available at sporting goods stores and local DMV license bureaus can be helpful.