I've still not had a complete TS day yet! My willpower is non existent and I get to the evening and a voice in my head goes *you can't survive on just shakes, you MUST eat something*. Blooming annoying it is but I'll get there. At least I'm not eating any of the crap I used to and I can honestly say I don't miss pasta or tatties.
From what I've been told you can drink as much coke zero as you like. There is a thread about what you can drink and it includes quite a few different things. I'm not a fan of plain water but try to drink at least half a pint a day. The rest is coke/dr pepper zero, tesco has flavoured water as well, tea/coffee with a drop on red milk. Avoid citric acid and sugar and you should be ok.
I used sweeteners in my shakes for a start, then lost my packet of sweeteners and not bothered getting more. Don't need them now as the shake is gone in about 5 seconds. I tried the vanilla one hot with coffee (yuch!) and the chocolate one hot but liked neither. Not tried it recently though so may have to go back and see if it tastes better.
I'm off work tomorrow so I think I will go for a full 100% day. OH is working late so will eat at work which takes teatime temptation out of the way.
Keep at it you are doing great!