I wouldnt recommend eating glucose or weightgain. These can cause insulin spikes and other problems. Gaining weight is EZ. Tomorrow when you wake up count the calories you eat throughout the day. Just eat like normal and count.
The next day add 500 calories to that. So if before you were eating 2000 calories, start eating 2500 calories. That's a little over a pound a week that you can gain. 5-8lbs per month. You dont want to get fat though, you want muscle mass. To make this muscle mass, you want good sources of calories...no fat, carbs, or simple sugars. Go right for protein. 1 gram of protein has 4 calories. Eat at least 1gram of protein per lb of bodyweight, and if you want to gain, raise that to 2grams per lb per day. Whey protein Isolate, or Hydrolyzed protein supplements are perfect for extra protein throughout the day. Besides, most americans dont get enough protein anyways.
http://www.intense-workout.com/weight_gain.html