try to get rebuildable type atomizers, either tank types or dripping type, the dripping type would be better, since you could tinker with it while you find the best resistance settings, it will be hard to get supplies in sg,
but if you could learn how to use a mech mod from youtube, and get one from somewhere, the batteries and chargers are available here in sg,
and also the kanthal wires and wicking material for the atomizer,
you could diy 0 nic juice from veg glycerol/pg and flavourings sold at bakery shops,
and as for ejuice with nicotine, you will have to source them elsewhere, across the shores of this island..