C (GCC), 176 166 bytes

-10 bytes thanks to @ceilingcat

float x;main(a){for(char b[9],c[9];~scanf("%d%s%s\n",&a,b,c);)x+=a*(*b-98?*b-103?.02:.2:.5)*(*c-98?c[1]-97?2:-1:c[1]-111?1:5);printf("%f %f",x>0?x:0,fmax(0,x*10-5));}

Attempt This Online!

Javascript (ES6), 111

Takes input as arrays of arrays of strings/integers e.g.

[[4, "shots", "booze"],
[1, "glasses", "wine"],
[2, "bottles", "beer"],
[3, "glasses", "water"]]

Outputs to simple array e.g. [1.2, 7]

a=>(b=0,c={s:2,g:20,b:50,o:2,e:10,i:5,a:-10},a.map(([d,e,f])=>b+=d*c[e[0]]/c[f[1]]),g=b>0?b:0,[g/10,g>5?g-5:0])

#Explained

a => (
b = 0,                                           // Counter For Alcohol Level
c = {s:2, g:20, b:50, o:2, e:10, i:5, a:-10},    // Look up for values
a.map(                                           // Loops over array
  ([d, e, f]) =>                                 // Sets d,e,f to respective array indexes 
     b += d * c[e[0]] / c[f[1]]                  // Increases Level by values from lookup
  ),
g = b > 0 ? b : 0,                               // If Level is lower than 0 make it = 0
[g / 10, g > 5 ? g - 5 : 0])                     // Output: Level / 10 and Level - 5 bound to 0

TSQL, 301, 299, 219, 206 Bytes

Input goes into temp table #I (you said any format :)

SELECT * INTO #I FROM (
  VALUES
    (4,'shots','booze')
   ,(1,'glasses','wine')
   ,(2,'bottles','beer')
   ,(3, 'glasses','water')
) A (Q, V, N)

Code:

SELECT IIF(L<0,0,L),IIF(10*L-.5<0,0,10*L-.5)FROM(SELECT SUM(Q*S*P)L FROM(VALUES('bo%',.5),('be%',.1),('wi%',.2),('wa%',-.1))A(W,S),(VALUES('s%',.2),('g%',2),('b%',5))B(X,P),#I WHERE N LIKE W AND V LIKE X)A;

Thanks for the ideas to improve it, Micky T :)

Perl, 133 119 + 3 = 136 122 bytes

%u=(o,.5,e,.1,i,.2,a,-.1,g,2,b,5,s=>.2);/(\d+) (.).* .(.)/;$x+=$1*$u{$2}*$u{$3}}{$_=($x>0?$x:0).$".($x-.5>0?$x-.5:0)*10

To be run with perl -p. Takes line-oriented input on STDIN, produces output on STDOUT.

Less-golfed version:

# char->number conversion table
# declared using barewords except for 's', which can't be a bareword
# because it's a keyword
%u=(o,.5, e,.1, i,.2, a,-.1, g,2, b,5, s=>.2);

# extract the number, first letter of first word, second letter of
# second word
/(\d+) (.).* .(.)/;

# do unit conversion and multiply up all factors
$x += $1 * $u{$2} * $u{$3}

# hack for -p to produce an END { ... print } block
}{

# format output
$_ = ($x > 0 ? $x : 0) . $" . ($x-.5 > 0 ? $x-.5 : 0)*10

Thanks to dev-null for suggestions saving 11 bytes.

JavaScript (ES6), 131

a=>a.map(s=>([a,b,c]=s.split` `,t+=a*[50,20,2]['bgs'.search(b[0])]*~-'0236'['aeio'.search(c[1])]),t=0)&&[t>0?t/100:0,t>50?t/10-5:0]

Less golfed

a=>(
  t=0,
  a.map(s=>(
    [a,b,c] = s.split` `,
    t += a * [50,20,2]['bgs'.search(b[0])] // char 0 is unique
           * [-1,1,2,5]['aeio'.search(c[1])] // char 1 is unique 
           // golfed: add 1 to get a string of dingle digits, the sub 1 using ~-
    )
  ),
  [ t>0 ? t/100 : 0, t>50 ? t/10-5 : 0]
)