Actually, pharmaceutical grade fish oil has virtually no smell at all and is generally sold in gelcaps, so there's no taste of any kind. With the regular cheapo drugstore types you will burp up a nasty fish taste, but that's not the case with the good stuff.
If by drugs you're referring to vitamins, I don't think you have to worry about that. Vitamin supplements are very safe and have no ill side effects when taken in proper doses. If you stick to reputable companies, you'll find safety and purity is pretty high. Some are more bioavailable than others, but all are safe for you. The best are actually naturally harvested.
As for nutritional info, there's a lot of sources, but Google is probably the easiest. Just type in "nutritional info" or some variation thereof.
As Luv's says, don't expect miracles right away. You'll have to increase your intake of vitamins and mineral for a few weeks before your body has replaced its stockpiles to the point where you'll begin to reap the benefits. Unfortunately, much of modern food is nutritionally empty- foods rich in white flour and refined sugar typically provide almost no nutrional value at all and are just empy calories. Even some very healthy fruits and vegetables are less nutritous than they used to be as the soil is increasingly depleted of mineral. Chromium, for instance, is only present in a plant if it's present in the soil, and it rarely is.
No matter how healthy you try to eat, chances are you'll still benefit from a good multivitamin. The cost certainly isn't high, usually just pennies per day. Do take care, though, to buy vitamins that don't contain iron if you have children in the house. Iron poisoning is a common problem in children.