I'm so excited for you!
Tip re Psyllium husk: mix it in and eat immediately, do not wait for it to swell in the yoghurt or whatever, let it swell in your stomache.
Tip re squirt bottle: doesn't have to be anything special. The squirt bottles of sports drinks are fine and one always fits in whatever bag I take with me.
As my best friend said to me: "Welcome back to the world of a*s*s-sh!ters!"