DS is 10, and still regularly wet - dd has been dry since she potty trained about 2.5years. We've similar advice as auditangel, except not the bed-changing one (ds is in a bunk bed, so not realistic anyway, but I'd feel slightly uncomfortable that this would feel like a punishment, for something that he can't help)
Fizzy drinks are another no-no, and we were told NOT to lift, however tempting, as it doesn't help their development. Once they hit 8 (I think it's still too 'normal' for you to get a referal at 7) the 'wee clinic' is helpful - and you can also consider desmopressin - a nightly tablet which supresses wee production. DS has used both routinely, and for special occasions (eg school overnights/cub camps etc)
More practically, we double-sheet the bed - so a mattress protector, then sheet, then another matress protector, then another sheet. In the middle of the night, makes it easier to peel off the top layer & bed is ready again.
Worth remembering (& stressing to your sons) this is hormonal - so not something that the child themselves can control. DS is very chilled about it, and has never had any teasing from his mates (many of whom he has told!)
Oh - and my two shared a room when they were younger - dd never woke up when ds woke wet - but tbh, he rarely wakes - just wakes in the morning in a pool of wee ;-) He wore nighttime pullups for a long time after she was out - I just told them both different people have different needs, no drama. They joke that she has a bladder of steel...