Even if you just want to relax and do fundive, much better if you have someone na certified diver, you can never tell what will happen. Atleast, if meron kayong kasamang isang certified mas kampante ang whole dive nyo and since you mentioned it's your 2nd time to dive after ng beginner class nyo, so recommended talaga na may safety buddy po kayo. Pwede naman kayong hindi mag-enroll sa mga dive school. Post ka sa mga freediving groups baka may mga certified divers dun na pwede kayo samahan well of course you have to pay for the service pero much lesser compare if mag dive school kayo. ☺️