Id like to keep my reputation low so i can use evil char in my party.My question is what is the best way to reduce my reputation without having to kill pple???

Steal and be cought
that usual lowers your rep
also bring valygar back to the crowled wizards that will reduce your rep with 1
don't ask me why a good character as me should know that but i just do

And Good will conquer evil

POSSIBLE SPOIL HERE, depending on whether or not you have gotten through Spellhold and have at least reached the Underdark. If you have not stop reading right now. If you have, read on!!!!!!!!!
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You can turn into the Slayer and this will lose you two reputation points. Make sure no one from your party is near you or they will meet their maker pretty damn quick.