Sounds like you will be bending by hand. Don't worry about making a jig for bending yet. If you've bent the sides by hand you can do the binding too.

You don't have to glue your purflings to the binding before bending Mike. You can glue it all inplace in the channels when you're ready.

What you can do is tape all 4 pieces of binding together with the purfling lines stacked between them. Use about 5 or 6 pieces of basic masking tape (one at each end and the other's spread between the ends). Tape it tight. So stack your binding and perfling like this as it will help support the purfling (and binding too for that matter) better. Bending one wider piece is easier than bending 4 narrow pieces.

Anyway, stack like so: binding/purfling/purfling/binding/binding/purfling/purfling/binding

This should give you about 1 - 1-1/2" of width.

When you bend, make sure you use something that will support the outside of the bend (for bending bindings, I use one of those thin 12-18" metal rulers that is really flexable [take the cork off]), especially with curly maple (any highly figured wood) as it will tend to crack right on the grain line and you'll have a hard time. Place the binding on your pipe and the flexable steel ruler on top of the binding, this will put pressure on the outside of the bend and help the binding bend instead of snap!

As for the "water", you don't really need much at all. Just a lite spritz with a spray bottle will suffice. When bending by hand you will need to spritz the wood periodically as it will dry out while getting warm from bending adjacent sections.

When you've successfully bent your bindings and purfling lines, use some mineral spirits or naptha to remove the tape and the tape residue. Now you're ready to install the bindings and purflings in the channels on your guitar body.