Learn Italian: Senz'acqua, la foresta sparirà. - Without water, the forest will disappear.

It comes from the regular -ire verb sparire (to disappear). To form the future tense for la foresta (which acts as an "it" or lei), we take the infinitive, drop the final -e, and add the ending -à. This gives us sparirà.

I remember sparire uses the "-isc-" pattern in the present tense. Does that affect the future tense?

Not at all! Even though you say la foresta sparisce in the present tense, the future tense ignores the "-isc-" pattern completely. You just build it straight from the infinitive sparire and add the regular future endings.

Why is there an apostrophe in Senz'acqua?

This is a contraction of senza (without) and acqua (water). Because senza ends with a vowel and acqua starts with one, the final -a of senza is dropped and replaced with an apostrophe to make the pronunciation flow smoother.

Does the accent mark on sparirà change how I pronounce it?

Yes, the accent mark tells you to put the spoken stress on that final syllable: spa-ri-RÀ. In the Italian future tense, the io (I) and lui/lei (he/she/it) forms always end with an accented vowel, which is crucial for getting the spoken rhythm right.