Tomato Problems Already!

I noticed brown spots forming on the leaves of my tomato plants.  A quick Google search leads me to believe that this is fungus, possibly early blight.  This is what I see:

My organic solution is a mixture of:

• 1 part milk
• 4 parts water
• 1 tablespoon of baking soda for every quart of water
• A few drops of dishwashing soap

I find close variants of this mixture cited all over the web.  This link is an example.  I used a spray bottle to apply to tops and bottoms of tomato plant leaves.  Time will tell how effective this is.