1.) A reaction flask lol. Depending on what alcohols and aldehydes are involved, you'll probably need a heat source too.
2.) Clamp a boiling flask to a stand and fit a condenser onto it. In other words, just a reflux apparatus although I don't know why they tell you "primary and secondary alcohols" or why refluxing them would be different to refluxing anything else.
3.) Just a flask and a heat source.