I have acid reflux. will i ever be able to drink soda, drink coffee and eat spaghetti sauce again?

Possibly: Actually, little is known about what happens regarding untreated GERD or heartburn symptoms over a lifetime. Most information would say it persists, especially if nothing changes. Weight loss would be expected to have a favorable effect. Treatment with PPI/other medications often improves things enough so that the common offenders you mention can be tried, in modest amounts, again. Good luck!

Moderation: You can, but the individual differences between patients is quite a lot. You will find from experience what things and in what quantity you will tolerate. Either of the three by themselves will prob be tolerated, but the combination of 2 or more will cause more problems.

YES!: Once your symptoms are well controlled you can start re-introducing these pleasurable items to your diet. However, you might never be able to consume as much as you used to without recurring symptoms or damage to your esophagus. Moderation is the key especially with sodas since they can not only worsen reflux directly, but also cause weight gain that can indirectly make reflux worse.