which one is it?
I want to do neither.

I don't want do it, too.
I don't want to do both of them.

Question

which one is it?
I want to do neither.

I don't want do it, too.
I don't want to do both of them.

Answer

As a general rule, you can only use one negative in an English sentence.
I don't like either one.  -- negative verb + either.
I like neither one. -- postive verb + neither

Answer

I want to do neither-this one seems fine to me.

I don't want do it, too- This should be "I don't want to do it either".
I don't want to do both of them- This one should be "I don't want to do either of them".