Water is not a side instruction with psyllium. It is part of how psyllium works.
Psyllium husk absorbs water and swells. That water holding ability is why it can support stool softness and bulk. If there is too little water, the mixture can become thick, sticky and uncomfortable to swallow. In the gut, a low water routine can also make fibre harder to tolerate.
A practical approach is to take psyllium with a full glass of water, not two hurried sips. Many people also prefer to drink extra water after it, especially when using a larger serving. If you are new to isabgol, start small rather than chasing a high dose on day one.
Your total day matters too. Tea, coffee and soft drinks should not be your only fluids. Fibre works better with a normal water routine across the day, along with fruits, vegetables and dal.
Be careful if you have swallowing difficulty, gut narrowing, severe ongoing symptoms or are taking medicines. Ask a doctor before using psyllium regularly.
With psyllium, water is not optional decoration. It is the partner that turns dry husk into useful soluble fibre.
Treat the glass of water as an ingredient, not an accessory. Psyllium without enough of it is a different, far less comfortable product.