Advice on hydration setup on bike

I use my aero bottle for races and trainer rides.  For longer rides it's a camelbak, I can carry plenty of fluids that will stay pretty cool for the ride, snacks, and other items with me.

If I ride longer then a 2 or 3 hours, I take an extra bladder and leave it in the cooler since I normally have to drive to my ride locations and swing by and swap bladders to keep cold fluids with me.

During races, the Aero bottle is for water only, and I'll ride with gatorade, etc on a behind the seat water cage, along with another water bottle to refill the aero bottle if needed before hitting another aid station.

Seems to work for me, but you'll find other ideas on these forums that may work better for your needs.

Good luck.

Training...downtube bottle plus aerodrink. If you need more, throw a bottle in your jersey pocket. If that's still not enough, camelbak.  

Racing: Same thing, but if it's a supported HIM or longer, feed off the land and skip the camelbak.

Training:

Road bike - two bottle cages, two bottles in my jersey pockets.  Stop to refill every 2 hours or so.

Tri bike - one bottle cage on downtube, two in jersey pockets.  Stop to refill as needed.

Racing:

One down tube bottle cage.  That's it.  Every race (pretty much) has on course nutrition.  Live off the course, that is what you are paying the entry fee for.  I personally despise "aero hydration" mechanisms.

x2

You don't need them, save some room in your Bento Box ........

Just get rid of the Bento Box.  

 can be helpful for those who bike in attire that doesn't have pockets like cycling jerseys.

 x2 on using a camelback for training rides, with a cage on the bike for liquid nutrition

Simple explanation:

You do not need to replace electrolytes during exercise.  There is absolutely no link between exercise induced cramping and electrolyte depletion.  The only reason to take in ANY sort of salt during exercise is so that if you are drinking ONLY water that you do not dilute the natural balance of salinity in your blood and cause hyponatremia.  And the amount you take in from regular nutrition (gels, sports drinks, energy bars) is more than adequate for it.

I remember talk here and on that other, somewhat "Slower, twitchier" web site about an MIT pod cast about how bento boxes cleaned up the "messy" air right behind the steer tube and could, in some cases make a bike more aero.

This minimalist thing on the bike is great for some...sadly I see many of them at the side of the road trying to flag down cars when they flat (again) in the middle of nowhere. 

As far as bottles go, I recall riding outdoors (although it is a distant memory). 

It is good to have the hydration "infrastructure" for training, and just take it off or don't use it for a race where they provide on course.

So aerbottle (I only use water - I use course and storebought water(in training) and dump it easily in there.) Anything sticky will splash out and, depending what's in it can attract beasties - Wasps can fly pretty fast especially when you are going uphill!

I use the old Profile one with the loofa sponge...I don't know about the new ones, I'd worry that that is just too much weight over the front wheel, it could make the handling sluggish? But that's just a guess.

I have a downtube I have one additional bottle on the downtube filled with my favorite mix - in concentrate - I take a slurp and wash it down with water. And I have the two behind the seat setup...those can be more concentrate, or water or tool bottle. On shorter rides, sprints, etc. you don't have to use it. 

This set up works really well for my 4-7 hour rides in the middle of no where with just one refueling stop at midpoint

It also worked really well at IMC. During a race you can always use an empty cage to take on a bottle from the course, be it Gatorade or Water.