HELP! Niche Water Filter Website needs Website Traffic

I have a domain that has been around for over 5 years. It has been very successful up until now. We changed our platform and all of our links have changed and now google has lowered the ranking of all of our keywords. Our traffic dropped 75% in the last 2 days. Previously, we were getting 350-400 visitors/day & now it's closer to 100-150. Now we have little to no traffic and we need it ASAP. Traffic needs to be very niche because we sell water filters. If this is link building, I do not want any NON-NICHE sites - I will not release any funds and will not pay for any non targeted sites. If this is article submission, the same thing goes - articles must be water filter related and the submissions must be niche as well. NO FFA, or NO link farms or NO 0-2 PR directory submissions. NO 0-2 PR site submissions, article submission sites, or link building sites will be accepted. Must be quality links. NO BLACK HAT OR GRAY HAT TECHNIQUES. We will check all links to ensure that the rules are being followed. If this is guaranteed traffic bid, I'm not even sure I want it unless you can guarantee conversions (I will be willing to place a conversion tracker in order to track everything). Please be sure you let me know what is included the FIRST month. This could be a long term service if we like your service.