

First of all, relax. Nothing is too big to take your life, just relax.
Can you please tell where you live (at least the country)? This can help us find some right steps for next course of action. First of all, Did you have any insurances for your house or any of your products, if so, then start by contacting the insurer, and in these cases, they would just give you sort of settlement price, becaus efor most things damage is done beyond repairs. Most likely your clothes (at least the natural fabrics, like cotton) would be all ruined. But synthetic fibres, and even some of your musical instruments (non wooden parts) and even some pc parts (depending on your cases, and actual salinity of water) would be recoverable, so please do consider to collect them.
You can make “khichdi” - It is a Indian dish, but not really, it is more of a procedure - basically get anything you have (rice, pulses, any other grain, just see if they are too hard, give a wash before, and let them soak for some time), add vegies(almost anything works, my favorites are potatoes, onions, tomoto, carrots, basically whatever is available in season), add spices to taste (I mostly just add salt and pepper, but anything is fine, just add a bit more, since all stuff previously added in a taste profile sense is bland) - then cook in pressure cooker (pressure cooker is not necessary, just accelerates cooking). Depending on how much you put - this can serve you many servings. If after cooking, it is dry for you, either have it with curd or youghurt if you want something cooloing, or just add a bit of vegetable broth and warm it up. Just store it well. It is cheap, not necessarily very nutritious (it is mostly carbs, fibre, and plant protien, which is not bad, but could be better). It is easy - no culinary skills required other than knowing how to wash and cut stuff, and operating your pot.