If I were you, I would take a step back. From your questions, it appears a good review would help you.
Aquatic plants, like any other type can grow well in any space they are given, with proper conditions. What is your goal with the 100x10x10? Are you growing for entertainment? Do you wish to engage in Aquaponics? If so, your yield might be limited.
Tap water, depending on where you are, can still contain salts, and if treated so, chlorine and iodine. Given all these factors, some treatment may be necessary.
You will probably get some London specific advise here, but you can add to it. For books, I suggest you visit libraries, local botanical gardens and book stores.
In addition, it always helps to find local resources. Speak to local master gardeners, gardening clubs etc. and if Aquaponics is your goal, speaking to store owners and employees will be very helpful. In most cases, they will want to make sure they sell you the appropriate equipment.
Since you are new, I would start small, even if you will set up the space right away, and expand with experience. If it is Aquaponics, your space is probably going to have limited yields. If you just want to grow plants for fun, this is plenty of space. I grew lotuses with my mom in India and here, I have grown fresh water plants very easily, in treated aquariums. I also have a couple growing right below the hose which leaks when on. This can be very fun!