Havent smoked in a while....THC test?

So i hadnt smoked pot for two months, and yesterday i ended up taking like 3 hits. I drank half a gallon of prune juice then added a half gallon of veneger and drank that. Am i safe? ill probably take one of those walmart ones becasue my parents are issuing the test.. If i drink ALOT of water today will i be safe?tomarrow?