Because psyllium is mainly soluble fiber, this powdered supplement makes you feel full.
If you can't stomach pills or powder, try gummies. Each serving of these gummies has 2 grams of added sugar and 6 grams of inulin fiber.
Each fiber supplement is generally available in a store brand, which is ideal for affordability.
Gluten-free diets require gluten-free fiber supplements. Citrucel is gluten-free methylcellulose fiber from plant cellulose.
Since fiber comes from plants, most fiber supplements are vegan, but you can be sure by picking a product that says so on the label, like this Amazon choice.
Wheat bran isn't a pill and can't be mixed into coffee, but it may be the next best thing to eating fruits and vegetables for fiber.