I don't know about Splenda in Auckland (I live in Melbourne), but I find it here in all supermarkets. It's right next to sugar.

Salt ... I don't touch it. I use No Salt, which is a substitute. The idea behind not having salt is that salt causes water retention.

Supplements ... I take a good multi and that's about it. If you're eating a good balanced diet (meat, vegies, salad and some fruit), you probably don't need to spend $s on unnecessary supplements. I've been experimenting with L-Carnatine before/after exercise, but it's hard to tell if it really makes a difference.

Good luck with the diet.

Alison