Owning or buying HL1 won't get you Half-Life: Source. The only way to get it is by buying one of the Steam offers that includes it or the retail collector's edition. But since you already got HL 2 you probably don't want to do that... Just gotta wait if Valve comes up with a possibility for HL 2 owners to purchace Half-Life: Source separately. (It hasn't changed really - water looks cool now and things bounce around 'cause of the physics, but essentially it's still the same, graphics and all.)
but still i lost my HL1 and haven't played it in days, now haveing beaten HL2 i just wanted to take a look back and see it revised. but alright I can wait, i just thought that I was the only one without HL1: source, like I was missing out