I saw nay, a big fat nay in fact and this is for several reasons.
Although it is possible to make an EWC tea without brewing it, it's not going to be as good as an aerated EWC tea. There are just too many factors you don't know about this tea. How fresh were the castings used to make this tea? Was it sufficiently aerated? How long has it been sitting in that bottle for? There are just far too many unknowns here, and $20 for a one gallon bottle is a plain rip off and here's why.
http://www.amazon.com/Pure-Organic-EC415-Earthworm-Castings/dp/B00062KQ42/ref=sr_1_1?ie=UTF8&qid=1395112504&sr=8-1&keywords=earthworm+castings
Just buy that bag, I use these all the time and they're wonderful for teas and topdressing as well as amending your soil. You should pretty much always have a spare bag or two of these castings handy just in case!
Anyway, I'm sure you know how to brew a tea but in case you don't it's quite simple. Just take an old sock, or better yet some cheap pantyhose (Walgreens has them, usually 2 sets of 2 for $1. Highly recommended) and fill it with 1/2 cup to 1 cup of EWC. Let that "teabag" sit in some fresh RO quality water and add 1-2tbsp of blackstrap unsulfered molasses (Brer Rabbit at Target is awesome, $2.79 a bottle can't be beat). Make sure you have enough aeration going on in your bucket and you'll have yourself as much tea as you want to make!
That ad claims it will produce 100 gallons of EWC tea for you. Well, if you use a 5 gallon bucket for brewing then only need to brew 20 5 gallon batches of tea to have as much as that $20. Not only are those 20 batches not diluted like what you're buying, but with a 15lb bag of EWC you'll be able to make a lot more than 20 batches of tea. Using only 1/2 cup-1cup will make your bag go a long ways.
Best of luck with your ventures using teas friend! Be sure to do plenty of research concerning organics so you don't make the same mistakes I did
Have fun and enjoy your organic quality!