Back in the saddle again...again

I really don't know what my deal has been over the summer. I just cannot seem to get my eating in check. I've been decent about working out (a triathlon looming at the end of next month has helped that), but my food habits have been awful. I did two weeks of South Beach Phase One and managed to drop eight pounds, but they've slowly crept back up. Well, five of them. I attribute it to summer eating and drinking. We have a pool in our backyard, so we have friends over pretty often to swim, which means we end up drinking while we're in the pool. I think I'm going to have to ease back on the vino and Froot Loop vodka if I want to reach my goal weight of 155. I do have some motivation--my brother-in-law is getting married in October, so I'm hoping to get back in the 150s by then. I think it's attainable, and now that I have a goal I think I can do it. I started back using Lose It today to track my calories, and I planned out breakfast, lunch, dinner, and snacks for the entire week. I know a lot of my issue lately has been not eating a good breakfast or lunch, so I thought if I planned both those out I wouldn't spend my days wandering around the kitchen snacking instead of having a normal meal. Like I said, I have another triathlon coming up in 34 days. I'm pretty freaked out about it to be honest. I don't feel like I've been training as much for it as I should be, but it's freakin' hot here. That makes it awful to get out and do any running or biking. I've been making it to a spin class at least once a week, but it's not the same as actually being on the bike. In these last few weeks leading up to the tri I'm really going to make an effort to spend time on my bike, regardless of weather, and I also need to try and get in a couple runs that are longer than 5K, as well as try and do at least one (ideally two) brick workouts.