How should I dispose of Sulfuric Acid?
As my high school chemistry instructor made us learn:

Do as you oughta - add acid to water.

If you add water to acid, the reaction dynamics work out badly and you get the MSDS warning - the water boils, this spits acid solution all over, and is dangerous.

If you add acid to water, the reaction dynamics work in a more favorable fashion, and nothing exciting happens as you dilute the acid.

To further enhance safety, you can use cold water and chill the acid, though this is a bit more than is really needed.

Gloves and eye protection are always advisable.