What is the ruling on selling falafel mixed with chili diluted with water at the request of some students, knowing that its price does not differ from that of regular falafel? Is this considered doubtful or deceptive?

It is not considered deception to sell perfume diluted with water if its price is the same as pure perfume and the water has no value. Nevertheless, it is preferable to provide pure and diluted perfume separately so that the selection can be made according to demand.