Accepting a bribe to give a customer a discount

Q: I work in a retail store. The owners intentionally mark up products by 50% because they expect customers to negotiate and ask for discounts. The actual intended markup is 20%. 

One day, a customer approached me about a product that had the 50% markup. I knew I had the authority to reduce the price down to the 20% markup. The customer said that if I gave him a discount, he would give me some money personally. I agreed, gave him the discount, and he gave me the money.

Taking oaths that one cannot fulfill

Q: I made oaths like reciting a certain prayer every night or performing missed (qaza) prayers after each obligatory prayer. If these oaths are broken every time I fail to fulfill them, it seems impossible for me to pay all their expiations. No matter how careful I try to be, there will always be oaths that end up being broken. I feel so helpless. I ask Allah for forgiveness, but there’s nothing more I can do. I try to pay expiations, but it feels like an ant carrying water to extinguish a fire. In this situation, is there no way for me to attain Allah's forgiveness? Please, give me some guidance.

Performing wudhu using a spray bottle

Q: 

1. If wuḍuʾ is performed using a spray bottle, is the wuḍuʾ valid? 

2. With regard to the obligatory (farḍ) parts of the body that must be washed in wuḍuʾ, is it necessary for two drops of water to fall from each hair and part of the skin, or is it sufficient for two drops to fall from the entire organ (e.g., the face), even if only two drops fall in total after spraying water?