I've been drinking lots of water with each dose and taking about 6 or 7 divided doses a day, mostly.
Just a suggestion, but it turns out that spreading the dose throughout the day isn't that useful in terms of fermentation in the colon. While the psyllium will in theory help it extend further, the problem is that the bacteria at the proximal end of the large intestine are so hungry, they will instantly ferment whatever appears before them. So, if you only take 2 teaspoons of PS at a time, those proximal-end gut bugs will eat it up before it has a chance to pass the proximal end of the large intestine. Interestingly, that is just the norm in most Western diets.
So, even with Psyllium added, you need to take a dose of PS that
overwhelms the bacteria at the proximal end of the large intestine, so that the RS moves past them towards the distal end,
where you really need it for SCFAs to be produced. That's why the enema approach is believed to be so effective (few people have tried it, besides Spanish Caravan). It delivers the PS where it needs to go and instantly starts SCFA production.
For those who don't do retention enemas, we need to literally flood our large intestines with PS in order to get a portion of it to reach the colon. So, that means a minimum of 2 Tbsp at a time, or "bolus" doses of 4 or more Tbsp at one time if you want a portion of it to get to the colon. I've never done more than 4 Tbsp at a time, but I can feel the SCFAs turn on, like a power station, when I do.
So, there's a big difference between fermenting at the proximal end and fermenting towards the colon. You still get some benefit even if you are only fermenting near the proximal end, but not nearly as much. So, flooding the whole intestine with RS is sort of necessary. From what Spanish Caravan says, it sounds like the enema (which he only does once or twice a week) creates more SCFAs than even a bolus dose does.
But, keep in mind that this does not mean that you should never take less than 2 Tbsp at a time. I still take less than 2 Tbsp/dose routinely. Not every dose of PS has to reach the colon. But, I think 1Tbsp of PS is probably the
minimum one should take at one time for it to be effective. And larger doses is something you'll definitely want to rotate into your routine.
Once you know you can tolerate at least 2 Tbsp in one day, that's a good sign that you should be able to take 2 Tbsp all at once. And occasionally, try a 4 Tbsp "bolus" dose just for good measure.
-- Also,
don't chug bolus doses — it won't feel very good.
EDIT: In other words, you don't have to swallow 4 Tbsp in one gulp. You can spread it out over a few minutes if you want.