Water as the primary liquid is probably the best option. Ironically, drinking water helps to prevent excess water retention -- a big issue in regard to Anadrol.
At the gym, you might want to try a carb drink to provide quick energy and avoid any catabolic tendencies. You don't want to start using muscle as an energy source.
A lot depends on your diet, caloric intake, and overall goals. (You don't sound like a power-lifter, mass-at-all-cost type of guy.)
Just an idea about a carb drink and insulin. Insulin post-workout requires a high-carb drink to shuttle nutrients into muscle cells, avoid hypoglycemia, etc. Why not take the drink throughout the training session itself? And then more once you finish working out?