Hello Louise
I'm on a re-start too, and started 2 weeks ago, my head was really not in it last week, and only used a cpl of my shakes. So decided to try again, but with a little exercise too and a few challenges. I'm finding it much easier this week and know i've shed a few lb's, my WI is on Friday and that will tell, lol.. I think if you've done it before, the re-start is harder, and not sure why.. But set yourself a goal and some mini goals inbetween that, and it'll be your incentive to push yourself. Drink lots of water, as you already know and if you really are still struggling, then look at adding a meal, ss+(Talk to your CDC), Which is the one I am on, as I cook every eve, for the family, its nice to sit down and have something, even if its not much. I tend to have Chicken and cury kale, or salad or cottage cheese and green salad.
Re gym, its not wise to do that, if you are doing any cardio work, but walking is ok.. I bought myself a pedometer and aim for 10,000+ steps a day.
Good luck,x