NL, it's easier to grow alfalfa at home (hydroponically), but it's not a grass. You can juice it but it's probably better to make sandwiches and salads.
Growing wheatgrass at home can done either hydroponically or in soil, but you need trays that provide drainage, and a system for tilting them to drain. They take up a lot of room compared to alfalfa in a mason jar. In a warm climate it can be grown outdoors though.
Some growers do think that using soil provides better quality juice. Some don't care. Those are the people that do it for a living.
The quality of the water counts. Better to be on a good well or spring, or at least filter the water to remove all the toxins.
Whole Foods does sell bags of grass when it can find a local grower to provide it to them. They are a bit expensive! Expect to pay $14/bag and this will probably provide you with about 10 ounces. So at 2oz a day that will not last a week. I would not recommend more than 2oz until you have done that for a while. WG juice can cause substantial cleansing reactions because of the enzymes. While this is good, it's also bad because if you get sick on WG juice you may not want to ever look at it again. Proceed with caution. It's powerful medicine. No parasites can stand it .... no mucus can withstand it. But it's strength is its weakness ... .it may cause you to keel over with nausea if you OD.
Good luck ... it's a great thing to discover. If you do rectal implants it goes direct to the liver, and that's a whole other thing that is very valuable.