-Sleep and exercise are wonderful. If you find yourself constantly getting hit with writer's block (or creative block, I guess), take some time to blow off steam at the gym or go for a run. Sometimes it can do wonders to clear your head. Also, getting enough sleep is pretty much the same idea (or the opposite idea, but with the same result?). I notice a huge difference in creative output if I have even an extra hour's sleep.
-I really should mention too, that like sleep and exercise, drugs are also pretty awesome. (I'm talking about caffeine, of course.)
I like to drink tea myself, mostly because I'm a huge wimp and coffee is too bitter for me (seriously, I'm not even kidding). Chrissie, Nikki, Kyle and Matt all like coffee. Charles, in a hardcore move, like Red Bull and chocolate milk. (Again, I'm not even kidding.) He doesn't drink them together, but he does carry them around at the same time, intentionally creating the illusion that he does. It's a move that's half like a tiger baring its fangs (DANGER! STAY AWAY!), and half like an eight-year-old getting ready to have an awesome day (ADORABLE!). I think he does these kinds of things on purpose, just get inside our heads and create fear.
Charlie anecdotes aside, my point is that caffeine makes brains work better. I wish it were otherwise, and I try to keep my creativity as natural as possible, but sometimes you just need that corrective jolt.
I should mention, too, that food and drink in general are important to keep the brain pumping on all cylinders. Your blood sugar naturally dips a few hours after eating, and your brain power usually goes along with it. Nutritionists recommend eating two or three snacks a day anyway, so you might as well keep your brain fueled up. In between breakfast/lunch and lunch/dinner, it can really help things to have a snack. It doesn't have to be anything major, I've been told 90 calories is enough for someone on a 2,000-calorie diet. Obviously, carbohydrate- and protein-heavy snacks are best.