I don't think for that loop that 1 thing of feser is gonna be enough and no you can't mix distilled water with feser.
I suggest getting say 2 litres of distilled water and run it through your loop to test for leaks and other things so you can judge if your 1 litre of feser will be enough.
T-line is plenty long enough. A t-line will act as a fill port and a "mini-res" if you will.
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