Why does well water turn brown?

my house is on well water.. this is the cloudiess brown water i have seen this year. i come to vist this house and stay the weekk,leaving on Saturday and return on Tuesday... the toilet and the dogs water from the water hose comes out clear and within seconds turns yellow or brown.. can u help me.. if their is a filter where do i put it .. and can i install it myself... thanks so very much for listening.. quitman