Are you in the USA?
If so …there is no ‘required’ penance on Fridays in the USA (except for Lent!).
Fridays remain days of penance …but if one does not do any …there is no sin.
But we are encouraged to do so…
and outside of Lent…one may always change what one has decided to do…
say you decided to give up meat…but someone makes you a meat meal… one can then decide to say …pray a decade of the Rosary or something…and eat with thanksgiving.
(or even if you just decide to change it )
Of course Lent is different. One is obliged to give up meat then…(but read the last url as to what counts…)
jimmyakin.org/2004/07/since_tomorrow_.html
But if you are not in the USA you will need to follow the universial law adapted by your local law…
but this counts for everywhere
jimmyakin.org/2004/02/the_law_of_abst.html
personally as to the soups Jimmy mentions…i still avoid them…