Potion effects using teams/tags

Okay so i have never made a minecraft datapack, but me and a few friends are running a minecraft server, and we want each player to have a Permanent potion effect, like the origins mod(we would use that but some of the players dont have a good enough computer to run mods), i was wondering if i could make a datapack that gets players on a specific team or smth a potion effect that cant be cleared by milk or death? if anyone knows how to do it, if someone has already done it, or if there is a way to do it with server side mods, that would be good help.