It’s a new approach to an old-school solution for a state gripped by severe drought: Place a brick in a toilet tank to conserve water with every flush. The new version, dubbed Drop-A-Brick 2.0, will be unveiled Thursday as part of an unusual effort to stimulate water-saving inventions through crowdsourcing and crowdfunding. The odd mix of participants includes beer companies (big water users) and water conservation programs (big water scolds). “We are looking for low-cost…