Pretty self-explanatory. Try to keep it under CR 5 tough. It is for bottled oozes, as per the alchemist discovery.
Provided the GM actually allows you to add templates to your oozes (which you should make sure of first), the Advanced Simple Template might be what you're looking for. It's my go-to solution for upgrading monsters slightly on the fly:
Quick Rules: +2 on all rolls (including damage rolls) and special ability DCs; +4 to AC and CMD; +2 hp/HD.
Rebuild Rules: AC increase natural armor by +2; Ability Scores +4 to all ability scores (except Int scores of 2 or less)
- Can be added to any creature (including oozes)
- Only increases CR by 1 (which should help keeping the CR low/below 5)
- Overall better stats, including attack rolls ("to-hit") and the reflex DC, in case you're using a Gelatinous Cube
- No need for tons of recalculations, which allows applying the template on the fly, in case you want to experiment with many different types of oozes