It's still annoying to have to swap them in and out all the time, particularly considering how fast they drain. The thing is, they probably need to consume water at that rate otherwise early game water pressure isn't that important, so I get that - it's just the mechanism I think is derpy/monotonous.
A better mechanic would be to just get rid of the camelpack entirely and consume water from any source in your inventory (bottles, buckets, tanks). That way as you progress through the tech tree, you can make yourself a couple of TE portable tanks with a decent size capacity to remove the annoyance/dependency on refilling the camelpack (or building a camelpack refilling station like someone else did).
Hmm, let me put it another way -
Early game, the food situation is very similar - there is a lot of drudgery in making enough variety of food to keep yourself fed with 100% effectiveness, but over time as you progress down the food "tech tree" you get better meals and more options, so it becomes more tolerable over time. You feel like, "Wow I have made some good progress here and my reward is not being annoyed as much". It's not like you are in real danger of starving anyway.
With the water situation, even as your ability to produce it improves to the point where it's not a major deal anymore, your ability to consume it stays pretty much the same - so you're pretty much dependant on that one game mechanic the entire playthrough and if it annoys you, well a few hours into it, it'll really start to annoy you
A couple of good suggestion (well in my opinion good suggestions!) would be to either:
1 - Add some other consumption mechanism that requires less drudgery early/mid game. Building a special tank with a higher capacity you can drink from in your inventory, or give the ability to refill the camelpack directly by clicking on a source block or a water container. Something like that.
2 - Add some sort of craftable food like "salt pills" that slightly reduces water consumption. This is legit and what people do IRL when in these conditions.
3 - Not sure if this exists or not, never got a chance to explore it, but an alchemy potion that reduced water consumption rate would be great. Give people an excuse to use the auto-brewer and maybe make splash potions that they could load into a dispenser (heh imagine taking your potion shower every morning before the heat sets in!). Even if they were stupid expensive people would make them.
4 - Add a "water cooler" block. Basically a tank that If you are standing within X number of blocks of it, you drink from that first. Great for derping around your base and not having to refill your camelpack all the time.
Anyway, sorry about the TL;DR. Been thinking a lot about this, because even if I do sound kinda whingy (and it's hard not to, I guess all criticism, even of the earnest and hopefully helpful sort sounds that way) I do like this mod a lot. In particular I really like the first few hours of it. It's really well done and unique and I certainly enjoyed my early game playthroughs. It's just as you approach the middle of the game it starts to wear thin on me for reasons already stated...