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Ya, it's really easy. Once you have a Bitcoin wallet address, you just post it and people can easily deposit directly into the account. For example, my BTC address is: 1ZkyD1Zyed5PUcqFUzeU6gFVHSRVPWMiq
Anyone can send me Bitcoin almost instantly and somewhat anonymously.
Anyway, it's really a great cause you are supporting in India and you will surely be blessed in your efforts! Great to have you join our community here and I hope blockchain technology and cryptocurrency can truly help enable some of those "Limitless dreams. Limitless possibilities." for the ones you are helping.