Rats are pretty smart and once thirsty will quickly discover how the water bottle works. If you don't want to chance it the way I learned from the guy I buy my rats from is to take the weaned in you hand and gently brush his nose against the little ball bearing at the tip of the water bottle As I said rats are smart and everything will click once he feels the water on his nose.
I wouldn't bother breaking up the lab block. I put both the small pellets and the normal large chunks in with my lastest batch of weaned and they seemed to prefer to just grab a big nugget of lab block and nibble on it all day. Even at that age they have a pretty good set of teeth.
He's looking good, good luck!
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