thinking of doing my half need advice

Seems like you have a reasonable baseline fitness.

Without much more info though, the only advice I can give you is to...

1.  Find a HIM training plan or create one yourself

2.  Follow the plan as best you can and train hard

3.  Have fun

From your logs it looks like you just recently hit those numbers last week, and it appears to be quite a jump from your previous weeks.  With biking it's not as big of a deal, but be careful increasing your run mileage too quickly, you'll risk overuse injury.

I would recommend increasing your swimming to twice a week if possible.  How do you feel after swimming 2000 yards straight?

Swim More...

Bike More...

Run More...

You have 12 weeks left, so you should be fine if you increase slowly... it seems the swim is the most lacking right now, but that maybe subjective... If you're just trying to finish a HIM, then you'll be fine... maybe a lot of walking when it comes to the last 13.1, but you'll finish.  If you are not used to Open Water Swims, you're going to struggle mightily on the swim.  If you're only at 2000 yds right now... it's going to be a challenge for you on the 2100 yd OWS.  Very doable, but it won't feel too good, IMO. 

Above all, have fun and enjoy the ride!

Find a way to get in open water.  There is no substitute.  It is like a whole different ballgame than swimming in a pool.  IMHO