I did something similar in the Philippines a few years ago. After consulting my nutritionist friend, she recommended giving out peanut butter for its high nutritional value. You could also try ordering in bulk from local vendors for better quality ingredients, which is what I did. The local community is very strong, so it’s not difficult to find someone who makes peanut butter. I also believe rice is a good option, as people always need more. 

I’m extremely skeptical about giving dairy powder in this context, mainly because of its contribution to animal suffering. Additionally, many Asians are lactose intolerant, and the environmental impact of dairy milk is significant.