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A variety of people have reported it solving IBS

I had IBS from about age 10 to 27. I thought it was completely normal to have "stomach troubles" 3+ days per week for that period of 17 years.

What fixed it for me was drinking a ton of water and eating 35-40 grams of dietary fiber per day. I went from 3+ stomach trouble incidents per week to literally about 1 per year. Other than the dietary fiber, I eat whatever I want including extremely spicy food on an almost daily basis.

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YMMV. My diet to manage IBS has minimal amounts of fiber. The focus on fiber of the past few decades has been mostly sales driven (i.e. breakfast cereals), the research is quite lacking. As usual in dietetics, no size fits all.

Most breakfast cereals have what I would consider low fiber - like 3g. Milk with lactose also isn’t a great choice for a lot of people.

I’ve never heard of a low fiber diet for IBS. In fact the first dietary suggestion on the non-profit IFFGD’s website is to increase fiber intake:

https://aboutibs.org/treatment/ibs-diet/dietary-fiber/

I have heard of people having problems with fiber if they rapidly increase intake or if they don’t drink enough water. I target 1.5 to 2 gallons of water per day.

As you said, everyone is different but you’re just the first one I’ve heard aided by a low fiber diet.

Metamucil can draw water into the lower intestine, which is terrible for some forms of IBS-D. Fibre is worth a try but it's not a magic bullet and can actually cause flares in some people.

As others in the thread have mentioned, the carnivore diet seems to work as well: https://crohnscarnivore.blogspot.com/

Indeed carnivore has 0 grams of fiber, and solves any digestive issues for me, as well as feeling incredible.

2 gallons of water? Is that like 8 litres? That's an enormous amount of water. I have to force myself to drink 2 litres a day

You've never heard of a low fiber diet, I've never heard anybody recommend that amount of water. Again, no size fits all.

I struggle to drink 2 litres. I got frustrated and got an app which will remind me and keep track of how much I am drinking and turns out I am drinking on average 1L. Any techniques you follow ?

My technique is very simple. I bought a water filter jug which I can fill and bring to my desk (I work an office job). Turns out that simply having the water available within reach rather than having to get up to refill my glass helps a lot (and the improved taste of the filtered water doesn't hurt - but this may not be necessary depending on the quality of the tap water where you live).

Going grab one gym bottles over the weekend. Thanks

If your IBS resolves itself by just adding more fiber, it probably was not IBS

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