Get yourself a plastic basin, you fill it a bit with water and you can clean the stuff there and then you rinse the dishes in your bathroom sink, you will be a lot more comfortable than trying do to everything in the bathroom sink
My personal advice if you can afford the space would be to setup a proper kitchen sink. If you’re not familiar with plumbing, maybe some comrades and neighbors can help you out. Otherwise, setting up a sink is rather trivial and you can find plenty of videos to help you out: “flexible” (french name sorry don’t know the english name) for water input and PVC for water output requires little tooling. A sink and a tap are rather common to find for free on the streets, or can be bought second hand for 5-10€ a piece. Overall if you need to buy everything new you can do it for ~100€ (which is quite a budget but for such accommodation is not a luxury), but some stuff can fit under your coat at your construction shop and when i need to setup a sink for some less-skilled neighbors it usually costs me under 10€.
PS: If you know some people with plumbing skills, it can be the occasion for them to teach you a few things. If they can spare two hours to help you out understand what you’re doing, don’t hesitate to be the person holding the tools throughout the entire process.
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From a legal perspective as a tenant, you can do any non-destructive modifications as long as you can revert them later on. Your landlord might be pretty mad about it though so if there’s a proper venue to request a decent sink, maybe try that first? (using registered letters, never use normal letters or phone for important interactions with your landlord is my personal advice)
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Because if the letter is not registered, it’s very easy for the other party to pretend the letter never existed in the first place. A registered letter they have to sign for so they cannot say doesn’t exist.
I’m not going to make recommendations. I once saw a retail store manager using a toilet as a mop bucket and I thought that was disgusting.
The large ones you can wash them wherever you shower or take a bath (assuming you have access to something like this sorry)
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