Miracle-Gro LiquaFeed Plant Food
If you want the absolutely easiest to feed tomato fertilizer in a non-organic formula, than Miracle-Gro 100440 LiquaFeed Tomato, Fruits and Vegetables Plant Food is the way to go. This is a 9-4-9 NPK ratio fertilizer, so you'll get lush growth with heavy fruit production. It’s fortified with essentials for overall plant health, but who knows where all of the ingredients come from or what they are made of.
Although you can actually measure out 2 teaspoons per gallon bucket of water and use it in a watering can, the best way is to get the special hose handle and sprayer that goes along with this. You literally just pop this bottle into the sprayer handle, then water your garden normally as the fertilizer automatically gets distributed. One bottle covers 400 square feet of garden and it should be used every 7 to 10 days.