Whats the easiest/quickest way to get BCH to make the purchase?
Buy on exchange
use the app coinomi. It has many different altcoins and you can exchange right on the app.
For Android only right?
Yes im pretty sure it is only for android. But correct it is on android. Problem is coinomi uses shapeshift or chengelly to convert your bitcoin or alts to bitcoin cash. Problem is shapeshift only has limited amounts of bitcoin cash available for you to exchange. And changelly do not offer bch . So your better off using a proper exchange platform online to trade for higher amounts of bitcoin cash. Yes its very frustrating,.
Goodluck!