There was no alternative (except nothing at all) to the bottle of lotion.
Perhaps, I’m misreading my Bible, but it seems that Our Lord is comparing the Pharisee who did not give to the woman who gave the best which might be obtained.
biblegateway.com/passage/?search=Luke+7%3A36-50&version=DRA
Luke 7:36-50Douay-Rheims 1899 American Edition (DRA)
36 And one of the Pharisees desired him to eat with him. And he went into the house of the Pharisee, and sat down to meat.
37 And behold a woman that was in the city, a sinner, when she knew that he sat at meat in the Pharisee’s house, brought an alabaster box of ointment;
38 And standing behind at his feet, she began to wash his feet, with tears, and wiped them with the hairs of her head, and kissed his feet, and anointed them with the ointment.
39 And the Pharisee, who had invited him, seeing it, spoke within himself, saying: This man, if he were a prophet, would know surely who and what manner of woman this is that toucheth him, that she is a sinner.
44 And turning to the woman, he said unto Simon: Dost thou see this woman? I entered into thy house, thou gavest me no water for my feet; but she with tears hath washed my feet, and with her hairs hath wiped them.
45 Thou gavest me no kiss; but she, since she came in, hath not ceased to kiss my feet.
46 My head with oil thou didst not anoint; but she with ointment hath anointed my feet.
Perhaps another biblical comparison might be found in the widow who gave her coins in the temple.
Mark 12:41-44Douay-Rheims 1899 American Edition (DRA)
41 And Jesus sitting over against the treasury, beheld how the people cast money into the treasury, and many that were rich cast in much.
42 And there came a certain poor widow, and she cast in two mites, which make a farthing.
43 And calling his disciples together, he saith to them: Amen I say to you, this poor widow hath cast in more than all they who have cast into the treasury.
44 For all they did cast in of their abundance; but she of her want cast in all she had, even her whole living.