Drinking water now is not doing a thing to speed up how quickly your body metabolizes THC. It isn't water soluble.

You need to buy some THC test strips and test yourself using your first morning urine - it is the most concentrated, so the "worst case scenario" so to speak.

You can buy them at big box stores or drug stores for $15-20 each, or look online and you can buy them for less than $1 each. They all work the same.