Strangely enough, your perfect (past tense) is really good, your present tense, on the other hand, needs work
Instead of
"j'ai", which is past tense, you should use
"je" which is I in the present. Also, you are currently using the infinitive which is the verb in the normal form, you need to change this to match the person who is speaking. For example,
"boire" means "to drink", but you want to say "I drink", therfore you need to conjugate the verb
Je bois
Tu bois
Il/elle/on boit
Nous buvons
Vous buvez
Ils/elles boivent
Therefore, the sentence should be
"Par exemple, je bois maintenant beaucoup d'eau et pas de boissons gazeuses"Can you please explain what you are trying to say when you use
"où que j'utilise pour boire des boissons gazeuses" as well as the final sentence which really doesn't make sense to me