At our local HF store, there were "0" and "00" sizes available in the Bulk Section. I got the larger ones. Put the ES in a container so you can scoop them up with the large end of the capsule (i.e. don't try to pour the salts into the capsule). One tablespoon of the larger size = 10 capsules.
The capsules will not be completely full, but it's a very fast way to fill them.
Concerned Aunt recommeded this to me as I was in your shoes -- gagging and retching the morning I tried my first flush! I felt awful and could not get it down.
Last night I mixed my olive oil/grapefruit mix in the blender with some apple cider ice cubes...sort of a smoothie -- not something I would order, but OK and downable!