The only thing you really need to do latte
art is milk, and you need some espresso to
pour into, of course, and a pitcher to pour
with.
For free pour you don't always need a pitcher
with a spout, but it really helps if you want
to be manipulating the lines or creating ripples.
A spout is a really great thing to have.
Although if you don't have one, you can still
do things like monk's heads, or solid-shaped
hearts and do some very basic rosetta-type
things.
But yes, for most free-pour latte art, you
want a pitcher with a spout.
You need espresso to pour into, and of course,
milk to pour with.
If you're doing etching or any sort of garnish,
then you might want to be using some syrup
for that or a chocolate powder, and then use
some sort of pointy object.
You can either use a thermometer, which barista's
usually have one around or really anything
pointy.
We have a screwdriver and an awl here.
A toothpick, anything that you can use to
paint or drag syrup or dots around the cup
is just fine.
That's everything you need to pour latte art.
