Walgreens has enema bags, you can do simple warm water enemas, does wonders for the colon, your mind and your liver. I get colonics twice a month, and if I do a few enemas, I get as much release from the liver as with colonics. Stay simple, rebuild your gut. Get off supps for a week and see if brain fog clears up, if so, you have a good indication that b12/methylation is the prob....good luck with flush!
p.s. I personally would not water fast right now, focus on gut health:)