Good luck spell?

i am still curious though as to why you did not want to boil the water.
please elaborate.

The warm to hot water of a bath can be enough to steep herbs such as Vervain in. It is common to add herbs to a hot bath. The herbs just take longer to steep than if placed in boiling water for a few minutes. Adding the herbs will still add the same aspects to the spell they are just administered differently. Making a separate Vervain potion and pouring it over you after the bath has cleansed you casts the good luck aspect to the spell. Adding it to the bath water also addes the same energies however this time the you sit in the potion as it steeps. Either aproch will work, however you may get better results from one of the other.

I just know the recipe for the spell indicated that the water should be boiled first.
As I said I put the water through a coffee maker.
The water could be boiled some time before the bath for it to cool sufficiently.
Or you could linger in the bath to give the water time to cool.
I think hot water pulls the essence of the herb into it more adequately than just the water.
You may want to try it with and without boiling the water to see which you prefer.
I still say, if skipping the one step of boiling, you might want to do the spell for more days to build or layer the luck over a period of time.