I agree with kraftner’s comments to the question. This is a bad idea and you stand a good chance of regretting it later. Store you data as granular post meta values. Everything is easier later on.
However, add_post_meta() and save_post_meta() will serialize objects/arrays for you. You don’t have to do anything special:
update_post_meta(1,'my_bad_idea',array('i','will','regret','this','later'));
And get_post_meta() will unserialize it for you:
var_dump(get_post_meta(1,'my_bad_idea'));
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