Here's a source:
http://www.deltaoxygensystems.com/
I can't link to a specific page (
http://www.deltaoxygensystems.com/id125.html) probably will not work and you'll have to start at the main page. (I just tried it and it works now, but sometimes they change their pages around.)
You can call them to ask for a specific configuration. At one time, they had a page with Homefill adapters, but it doesn't seem to be linked right now.
While many people have built pigtails with off the shelf components, by ordering a pigtail, you have some confidence that it has components certified for oxygen systems and has been cleaned for oxygen service. (You an also search LE and TMP (talkglass) for instructions that bypass the bottle adapter and go directly into the Homefill.)
If you have a Homefill with tanks, you can buy a pigtail and use one of the quick disconnects from one of the bottles. Just be aware that stores sell teflon tape certified to be oil free for use in oxygen systems.