Using "respectively" can be confusing as it is, and synonyms such as "correspondingly" only make it worse since we're not used to this. If you absolutely have to use one or the other, use "respectively." However, it is much less confusing to avoid "respectively" altogether, and it doesn't even take up any more space. Here's a better way of wording your example: "At the market, Samantha bought apples, John bought mangoes, and Jack bought oranges." This sentence is the same length as your original sentence (both are 13 words) and it flows much more easily.

-

In Strunk and White's Elements of Style, using "respectively" in this manner (and thus using a synonym in this manner) is discouraged:

Respective. Respectively. These words may usually be omitted with advantage. . . . [Example:] The mile run and the two-mile run were won by Jones and Cummings respectively. [Better:] The mile run was won by Jones, the two-mile run by Cummings. (page 57 in the Third Edition)

Following Strunk and White, the way to word your sentence would be: "Samantha bought apples, John bought mangoes, and Jack bought oranges from the market." The problem here is it sounds like Jack was the only one who bought from the market, an the others bought somewhere else. A quick solution is to rearrange the sentence: "At the market, Samantha bought apples, John bought mangoes, and Jack bought oranges."

to sweeten the bitter pill

To make something bad, unpleasant, or dissatisfactory easier to cope with, endure, or accept.

“Jane's job was absurdly repetitive and oppressive, but for her family, she sweetened the bitter pill as much as possible.”

I suppose you could also say that Jane had no choice but to swallow the bitter pill. In other words, she was left with no choice but to accept her lot (situation) in life.