When typing a list of dos and don'ts, do you spell dos like this?

it should be spelled "dos" simply because if you put an apostrophe in it, it denotes a missing letter or ownership.

As in Don't meaning do not.

Or, That is Henry's book. Meaning it belongs to Henry

I would leave out the apostrophe. Do's and Don'ts is totally inconsistent because the apostrophes in the two words mean different things. If you want to say Do's, it should really be Don't's as well, but that looks stupid. Dos and Don'ts.

I spell it Do's.Otherwise it looks like the number two in Spanish.

yeah. you only use ' when you are replacing a few letters. like don't- you are replacing the o in do nOt

Alternates: dos "do"s do's "do's". Up to you.

u con spal it huweva u wont . but do's might work better

Do's and Dont's.

I wouldn't use that word...

I would put Do: and Don't:

you should use an apostrophe

do's

It should be do's.