Hey there I got following file:

1307:
name: Faded Crystal/&9Crystal's &3&M&NMortality/&9&LCrystal's &3&LC&3&L&Ma&9&Lly&3&L&mps&9&Lo
ingredients:
- CRYSTAL/4
- GOLD_NUGGET/2
- LIGHT_BLUE_DYE/1
cookingtime: 26
distillruns: 1
color: '87cefa'
difficulty: 10
lore:
- + &fThere is no clarity here...
- ++ &fAs the waves crash against the sea,
- ++ &fThere is almost a moment of clarity...
- +++ &fTaste the salt from the waves
- +++ &fand feel the wind sting your face as
- +++ &fCrystal's Calypso brings clarity
servercommands:
- 'execute at %player_name% run playsound minecraft:ambient.underwater.enter master %player_name%'
drinktitle: '(&e☀&f)'

I asked myself if it's possible to add a delay with a servercommand?
Means it runs one server command, waits X amount of time and runs the next one? 
Is that possible?

Example:     
servercommands:
- 'execute at %player_name% run playsound minecraft:ambient.underwater.enter master %player_name%'
- wait 10 seconds - 
- 'execute at %player_name% run summon bee'   

No this is not possible, sorry. I'm sure you could use a scripting language to do exactly that, something like "Skript" or "Lua"