“A woman is like a teabag - only in hot water do you realize how strong she is.”

Another quote often attributed to her without an original source in her writings, as in The Wit and Wisdom of Eleanor Roosevelt (1996), p. 199. But once again archivists have not been able to find the quote in any of her writings, see the comment from Ralph Keyes in The Quote Verifier above.
A very similar remark was attributed to Nancy Reagan, in The Observer (29 March 1981): "A woman is like a teabag — only in hot water do you realize how strong she is."
Variants:
A woman is like a teabag. You never know how strong she is until she gets into hot water.
A woman is like a tea bag, you can not tell how strong she is until you put her in hot water.
A woman is like a tea bag; you can't tell how strong she is and how much to trust her until you put her in hot water.
Disputed

Source: Glass Houses

Aphorisms. Magnum in Parvo (2000)

Jane Would Have Been a Star Even as a Smith. Associated Press/Daytona Beach Morning Journal, 30 June 1963 http://news.google.com/newspapers?id=230eAAAAIBAJ&sjid=OcoEAAAAIBAJ&pg=3114,5294465&dq=the-institution-of-marriage-is-obsolete+fonda&hl=en

Glorious (1997)
Variant: I like my coffee like I like my women... in a plastic cup.
Source: Eddie Izzard: Dress to Kill

Source: Green Mars (1993), Chapter 7, “What Is to Be Done?” (p. 387)

Someone Like You (1998)

I'm Swiss (2005)