Home brews
Good move!
While I don't use ID-68, I have started mixing all of my DR chemistry from bulk chemicals. If I ever desired to mix ID-68, the only chemical I would need is to buy is Phenidone.
I started down this path when I found it harder and harder to find reliable supplies of liquid chemistry. I already mix my negative developers, Kodak D-23 and a variation of Ansco 17M, as well as stop baths and film and paper washing aids (aka Hypo Clearing Agent). As soon as my stocks of my paper developers and negative and paper fixers are exhausted, I will be mixing those, as well.
Mixing your own has a number of advantages. One is that you can mix any quantity you desire. For example, when I mix D-23, I make a 4.06-litre mix, which fills my one of my glass (nominal) 1-gallon bottles to the rim. You can also mix very small quantities for special uses. Three years ago I needed a pint of D-11 (not ID-11), and made exactly what I needed, no more, no less.
You can also modify formulas, if you desire. I use as my main negative developer a modification of an old Ansco formula, 17M. In my case, I have doubled the amount of sodium metaborate, and reduced the amount of hydroquinone by 1/3, which meets my particular needs.
I don't recall ever having seen Ilford ID-68 for sale as a packaged chemical, so there is another obvious advantage, mixing chemistry which exists only as a published formula. There are plenty of of those about!
One last advantage is that I believe that it's cheaper, over the long haul, than buying premixed chemistry.
Happy mixing!!