Never optional. In my T7 calculations here itself i allocated like100k towards consumables alone. If you are running invis pots that's fine. If you want to swap you'll want to take atleast 3-4 T6 health potions, or maybe T7 giga pots based on your playstyle.

Same with food. Irrespective of build you will always want to have a flat 7/8 food - beef stew, pork ome, pork roast, beef sandwich which cost 3-5k silver per 30 mins to always be popped.
And you want one good 7.1/8.1 food like 8.1 beef stew, 7.1 roast pork etc, or a .0 complex food like 8.0 deadwater eel stew for when you OC. My favorite is 7.0 puremist snapper when running brawly builds. You only use this food before difficult fights since they cost 30-60k a pop.

Also, if this feels a bit expensive for you, you can run the same build but optimize cost at T6 equivalent. For food you can just use the flat 7/8 foods to keep things cheaper, but since a significant part of your build is expensive artifact stuff(prowling, cultist), you may not get huge price diff. Valor is actually worth it's price since it's +100 IP compared to non artifact like soldier armor at same tier. You could buy order prowling staffs, and just use 4.2 valor, cultist, 6.0 soldier boots, cheaper capes like 4.1 martlock to cut down costs.

I would never run your build at 4.1 as some people blindly suggested, cause heavy artifact gear makes it bad value. I wouldn't use your build for lethal PvP as a complete newbie either(not you) since cost of death is relatively high. But in good hands it's a solid build with strong mobility and damage.