I'm using paraffin wax and PTFE powder, a local eBay seller had a listing for the combo. I'm happy with it and will keep on using it, as I got 1 kg of wax! ZFC suggests that paraffin wax works quite well, though it's not quite as good as the best commercial waxes.
I've been re-waxing every 300 km, though I've been wondering if I could push that further, especially since I don't ride in the rain. There's no noise or squeak by the time I reach 300 km.
But stripping the factory grease off new chains is a faff, so if I was starting again today, I'd be very tempted by the Silca strip chip.