Keto diet and supplements

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Second day on the keto diet,
I was a bit light headed this morning, felt tired, and the doms from working out yesterday are unusally intense,
after lunch I started getting a mild headache as if I was dehydrated and still feel a bit tired.
I've been reading about the symptoms of the keto flu but I didn't think it would kick in this early.

I've been tracking my electrolytes and of course I'm not getting enough,
but I'm pretty sure it was that way even before cutting carbs, why am I only feeling the effects now?

The minimum daily intake called for these electrolytes is

>5000 mg sodium
>1000 mg of potassium
>500 mg of magnesium

Can get 100% of the sodium I need by drinking a coup of broth
and I can get some potassium from salmon and spinach but I don't eat them daily,
I'm planning to supplement them with some tablets that have 300mg of the first and 225mg of the second.

These are pretty much my staples:
>eggs
>canned tuna
>salmon (smoked and grilled)
>chiken breasts
>beef (liver and meat only once per week)
>spinachs and lettuce
>butter, olive and hemp oil

And it's already kinda expensive, is there anything I can add?
Planning to get some sardines, nuts are too expensive fuck that.