I have a Soda Stream and I use Stur or Sweetleaf water enhancers that are sweetened with stevia and do not break a fast. I also sip on pickle and olive juice. I can’t do black coffee but I love herbal teas while I fast. Tazo has a Glazed Lemon Loaf tea that is so good with some Sweetleaf vanilla flavored drops. I like your Everything Bagel seasoning idea! I usually just crunch on some flake salt or Himalayan sea salt. Some bone broth (under 10 cals and <1gr protien) at “dinner “ and “lunch” times makes it feel more normal too.