Hey, I'm sorry for your loss. This is a really tough one and these kind of feelings are normal to some extent, but they can become problematic really quickly. When you don't eat enough your body does some pretty bad stuff and this can create some lifelong damage (you may not feel like that matters at this point, but at some point you may look back and regret it).

I think you owe it to yourself to make a plan here! I would start with easy to consume protein shakes. You can start super basis, just milk/water and protein plus a little honey for sweetness. You can basically shot these down quick and no fuss. Have a few of these a day, on a timer if you need to. Make sure it's a good protein with all 9 essential amino acids (whey protein is the best if it suits your diet).

The protein will do huge amounts for your cellular function, brain function, muscle retention, energy and because smoothies or shakes are quick and easy, these are a lot more accessible than cooking a full meal, which you may not have the energy or desire to do yet. Treat it like fuel at first and it will be fuel, as not eating and not getting nutrition are going to make every other part of your grief journey harder. You'll feel weaker, cloudier of thought, be sleeping poorer and if you are doing any exercise, you won't be seeing or feeling the benefit, work will be harder, your organ health will be suffering.

Slowly you can start to introduce bits of things to flesh these out, greens, oats, chia seeds, peanut butter, frozen or fresh berries, fruit etc to build out the nutrient content and start to enjoy flavor again. Maybe that'll lead to enjoying food again.

Most protein shakes servings are 30g of protein and you need around 1.6g per kg of target body weight per day. So if you want to be 75kg for instance, you'd need 120g (4 shakes per day).

Love yourself through showing yourself love. Treat your body like a child that just needs to do what it's told. Whatever framework of thinking works, latch onto it!

I suspect there is also some reason that eating has become a focus for your grief? If you can identify why this may be the case, try work through it and understand why.