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I'm curious to know and understand more how would a Buddhist deal with wastage under the following circumstances :

i)If it was an impulsive buy and you don't like the item after that and at the same time don't wanna keep it as it may took up the space available. Or would you rather just use it but you are obviously unhappy using it.

ii)If it was something edible, e.g. you thought of trying out new food but realize later it doesn't suit your tastebud or worse, you find it hard to finish it.

iii)Someone got you a gift but you may not like it or it's not something you want, would you keep it? By keeping it and not using it is equivalent to wastage or would you rather use it but deep down you wont't feel happy using it cos it's not something you want. The struggle or rather dilemma is you may just use it cos you don't wanna disappoint the person who gave you the gift but on the other hand, how do you even find peace and happiness doing something you may not like.

I'm constantly at the crossroad of learning to be grateful for what i have for many of them out there may not be able to have what i have. But i can't find peace or even happiness if it causes great deal of pain for accepting something which i don't like or it's not something i wanted.
I'm assuming Buddhism does not teach us to accept blindly even you can't. How do you even live a life like that?
Feel free to share your thoughts.
Thanks & sadhu sadhu sadhu...

The Kula Sutta refers to how wealth & material goods are preserved & not wasted, as follows:

In every case where a family cannot hold onto its great wealth for long, it is for one or another of these four reasons. Which four? They
don't look for things that are lost. They don't repair things that
have gotten old. They are immoderate in consuming food and drink. They
place a woman or man of no virtue or principles in the position of
authority. In every case where a family cannot hold onto its great
wealth for long, it is for one or another of these four reasons.

Apart from this, Buddhism also teaches generosity is a valuable practise. If we have things we do not need or want, we can simply give them to other people.

There are many Sutta and Vinaya deals with waste.
Most of the instructions are for monks in regard to the use of food, lodging, and clothes.
The instructions to lay, followers, are found in Parabhava and Sigalovada Sutta.

If you don't want or don't need something that you have, donate it or give it away to others who need it, instead of throwing it away.

Donating to monks or virtuous people is better than donating to unvirtuous people. But any kind of donation is a source of merit.

From AN 3.57:

"I tell you, Vaccha, even if a person throws the rinsings of a bowl or
a cup into a village pool or pond, thinking, 'May whatever animals
live here feed on this,' that would be a source of merit, to say
nothing of what is given to human beings. But I do say that what is
given to a virtuous person is of great fruit, and not so much what is
given to an unvirtuous person.