Do these sentences have the same meaning?
?Saying something, I sit, look at the water and drink it with my right hand in three breaths to quench my thirst.
?Saying something, I look at the water and drink it with my right hand in three breaths to quench my thirst while sitting up.
?Saying something and looking at the water, I drink it with my right hand in three breaths to quench my thirst while sitting up.
"I drink it with my right hand" is somewhat oddly written. Also, we don't drink in "breaths"; you could say "three gulps" instead. "Saying something" feels vague, but it would be OK if you intentionally don't want to provide more information about what was said.
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"I drink it with my right hand" is somewhat oddly written. Also, we don't drink in "breaths"; you could say "three gulps" instead. "Saying something" feels vague, but it would be OK if you intentionally don't want to provide more information about what was said.
These points aside, your first sentence seems best. "while sitting up" feels slightly awkwardly placed in the other two sentenc