I second that! Drinking enough water is so important and will more likely lead to weight loss or maintenance.
Hard boiled eggs are a great source of nutrition or even egg whites. Low sodium nuts and dried fruit, high fiber cereal, fruits, greek yogurt, veggies (like cucumber and carrot sticks). I recently purchased "Ball" brand plastic canning freezer jars (16oz) and these are awesome, safe, BPA free, etc. and what I do is make protein shakes or smoothies for the week and then stick them in the freezer to grab and take with me. They're perfect because it thaws nicely within a few hours (especially during summer!).
If you're craving a little chocolate, No Pudge fudge brownies are awesome and 0 fat! So easy to make too! You can usually find it at a Whole Foods or Sprouts or Fresh and Easy store. My fiance loves these! I usually pour the batter into muffin tins and so they come out like mini muffins, easy to pop out of the tray and put into a container. They make a great snack when you're craving a guilt free treat.