Will I pass?

I'm about 5' 9", 128 pounds, fast metabolism. Skinny, not much fat on me.
I'm getting home tested on the 15th, last time I smoked was the 29th, and it was a res hit. That weekend I smoked a good deal on Saturday, and lightly one or twice a day (like thimble shit) until tuesday. About 10 days before that I was using it whenever I had it, daily. Essentially it was significant use.

Do you guys think I got enough time to pass? 17 days...im definatly gonna drink a shitload before the test, my parents don't seem to notice if my pee is only slightly yellow. I don't wanna risk using bleach. Will salt do anything, if I have some peices under my fingernail? I know it'll have to dissolve, though they dont examine the sample well at all.

My parents knew I was smoking the weekend of the 19th with good shit, a few times, and that I did it for a few days straight. I can pass that off as heavy use and be a 30 day clearing period. I kept smoking to say my goodbyes until the 29th.

You guys think I'm safe? I hear drinking water heavilly doesn't really do much to clear your system, it just dilutes the sample the day of. Any facts to back this up?

Thanks for the help!