Drinker cup system help!

I know there is a lot of people using the drinker cup water systems. I really want this to work as I can't carry water very well. (Bad Back) My plan is to have a rain barrel and just fill the barrel with water as needed.

I just received my parts in the mail from Cutler supply.

This is the cup i am using.
http://www.cutlersupply.com/cart/index.php?main_page=product_info&cPath=11_60_63&products_id=489

And this is the connector I am using.
http://www.cutlersupply.com/cart/index.php?main_page=product_info&cPath=11_60_63&products_id=491

I also purchased the water regulator. just in case I will have too much pressure from my barrel.
http://www.cutlersupply.com/cart/index.php?main_page=product_info&cPath=11_60_63&products_id=492

Well Here is my problem......I don't know how to connect the connector to the pvc pipe. It looks like there are ridges on the side of the connector that you would "glue" to the pvc pipe. simple right!?!

Well......My DH thinks it won't glue on and seal very well because of those ridges. I am thinking they will just melt with the glue.

Also....My regulator came with 2 small straight connector pieces for the 5/16" tubing. Do I just use one for the regulator "out" and the other in the one end of my pvc tube with an adapter? I think I seen a pic somewhere here.

I usually am very good at figuring "puzzle's" out.....But this one, I am having a hard time with.
Maybe I just need to go to menards and stand in the aisle and look to see what will work.
I don't know. Feeling dumb!