In a small saucepan, whisk soy sauce, watr, honey, garlic and cornstarch together until smooth.
Heat over medium-high heat and bring to a boil. Reduce heat to medium and whisk constantly until desired thickness.
Remove from heat and let it cool.
Combine half of the teriyaki sauce (once cool) and chicken in a bowl and let it marinate for at least 30 minutes in the refridgerator. Refridgerate remaining sauce for later.
When the chicken is finished marinating, place your chicken, peppers, and zucchini on skewers (if you are using a grill pan heat to meadium heat, use a little oil to cook chicken).
Once the grill is hot, place skewers on grill. Turn skewers about every 3-5 minutes until chicken is cooked though. On the final rotations baste with the rest of the teriyaki sauce.
Remove skewers from grill.