Chinese pronunciation [ds'] of再(zài)?

The pronunciation [ds'] of再(zài) in the phrase再见(zàijiàn) should be pronounced as [z] and how should I pronounce it?

What does the Chinese Pinyin phrase, “wei ta qi dao” mean?

I have seen this in writing on Chinese blogs. However, without the accent marks, I can't determine what this phrase means. Thank you.