I have crohns disease, and malabsorption due to multiple surgeries and intestinal inflammation. I have had to find many medications that are either small, very soluable and/or in liquid form. What I have found to be a very helpful item is the multivitamin Centrum, which comes in liquid form. I find it to be palatable, and it is very effective.
Hope this helps. You can buy it right over the counter. It is usually found among all of the vitamins and multivitamins. There are some other vitamins, minerals, and supplements also in liquid form. Sometimes they are not on the shelves, but if you ask your pharmacist, they can tell you if available in liquid form, and then order it for you.
Take care, and good luck.