Foamy urine. Test at the home by strips?

Doctor... From few weeks iam passing a foamy urine. After flushing my urine is very fomy. Last 4 months I had suffered with constipation problem.so, I started drinking 4 lits of water everyday this 5 th month my urine started foamy if I drink more more my urine is clear and normal(not foamy). While constipation is going on I drunk the 4 lits. To complete 4 lits,I used to drink the one lit at a time.like that I had completed the 4 lits. In complete one day I drunk in 4 sessions in one every session I drunk one lit at a time because lack of knowledge I don't know to drink like that, and I continued it for 3 months. After 3rd month I stopped that time table.This is the 5 th month iam noticing the foamy urine. And few times their is a burning sensation after urine.so, please tell me the solution for this prblm amd if I want to to do the tests,please tell me the which type of kidney function test is enough for me. Note: can I do the protienuria test at the home by strips?